Tetrazole derivatives, having a further unsaturated heterocyclic ring anti-ulcer composition containing the same and method for treating ulcers

ABSTRACT

Tetrazole derivatives of the formula: ##STR1## wherein R 1  is an optional defined substituent; A is sulfur or a lower alkylene-thio, l is 0 or 1; B is a lower alkylene; R 2  is hydroxy, a lower alkoxy, or a group: ##STR2## wherein R 3  and R 4  are optional defined substituents, or the R 3  or R 4  may combine together with the nitrogen atom to which they are joined to form a defined heterocyclic group, and a pharmaceutically acceptable salt thereof, which have prophylactic or therapeutic activities against peptic and/or duodenal ulcers and also anti-inflammatory activity and are useful as an anti-ulcer or anti-inflammatory drug; processes for the preparation of the tetrazole derivatives; and pharmaceutical compositon containing said tetrazole derivatives.

This application is a divisional application of U.S. Ser. No. 609,332 now abandoned, filed May 11, 1984, which is a divisional application of U.S. Ser. No. 333,806 (U.S. Pat. No. 4,540,703), filed Dec. 23, 1981, which is a continuation-in-part application of U.S. Serial No. 124,710 filed on Feb. 26, 1980 now abandoned. This application is also related to U.S. Ser. No. 609,333 (U.S. Pat. No. 4,663,323), filed May 11, 1984.

The present invention relates to novel tetrazole derivatives, a pharmaceutical composition for treating peptic and duodenal ulcers which contains as the essential ingredient the tetrazole derivatives, and a method for treating peptic and duodenal ulcers by administering the pharmaceutical composition.

The compounds of the present invention are tetrazole derivatives of the formula: ##STR3## wherein R¹ is hydrogen, a lower alkyl, a cycloalkyl or phenyl; A is sulfur or a lower alkylene-thio; l is 0 or 1; B is a lower alkylene; R² is hydroxy, a lower alkoxy, or a group: ##STR4## wherein R³ and R⁴ are the same or different and are each hydrogen, a lower alkyl, a cycloalkyl, phenyl, a cycloaklyl(lower)alkyl, a phenyl(lower)alkyl, a hydroxy(lower)alkyl, a saturated or unsaturated heterocyclic group containing one or two hetero atoms selected from the group consisting of nitrogen, oxygen and sulfur, or a lower alkyl substituted by said saturated or unsaturated heterocyclic group, or the R³ and R⁴ may combine together with the nitrogen atom to which they are joined with or without being intervened with oxygen or nitrogen to form a saturated or unsaturated heterocyclic group which may substituted with a lower alkyl or a lower alkanoyl; said cycloalkyl, phenyl and phenyl(lower)alkyl may have on the cycloalkyl or phenyl ring one or two substituents selected from the group consisting of a lower alkoxy, a lower alkyl, a halogen, an N,N-di(lower)alkylamino, nitro, aminosulfonyl, hydroxy and a lower alkanoyloxy, provided that when l is 0, B is --CRR'--(CH₂)_(p) -- (wherein R and R' are each hydrogen, methyl or ethyl, and p is 0 or 1) and R¹ is methyl, ethyl, n-butyl, cyclohexyl or an unsubstituted phenyl, R² is other than the groups selected from hydroxy and ethoxy, and when l is 0, B is --CR"R'"--(CH₂)_(q) -- (wherein R" and R'" are each hydrogen or methyl, and q is 0 or 1) and R¹ is cyclohexyl, n-butyl or an unsubstituted phenyl, R² is other than the groups selected from a group: --NR^(3') R^(4') (wherein one of R^(3') and R^(4') is hydrogen, methyl, ethyl) or benzyl, and another one of them is hydrogen or ethyl and a heterocyclic group formed by combining R³ and R⁴ with nitrogen in --NR³ R⁴ being morpholino, and a pharmaceutically acceptable salt thereof.

The present invention provides also a method for treating peptic and duodenal ulcers by administering a pharmaceutical composition which contains as an essential active ingredient a tetrazole derivative of the formula: ##STR5## wherein R¹ is hydrogen, a lower alkyl, a cycloalkyl or phenyl; A is sulfur or a lower alkylene-thio; l is 0 or 1; B is a lower alkylene; R² is hydroxy, a lower alkoxy, or a group: ##STR6## wherein R³ and R⁴ are the same or different and are each hydrogen, a lower alkyl, a cycloalkyl, phenyl, a cycloaklyl(lower)alkyl, a phenyl(lower)alkyl, a hydroxy(lower)alkyl, a saturated or unsaturated heterocyclic group containing one or two hetero atoms selected from the group consisting of nitrogen, oxygen and sulfur, or a lower alkyl substituted by said saturated or unsaturated heterocyclic group, or the R³ and R⁴ may combine together with the nitrogen atom to which they are joined with or without being intervened with oxygen or nitrogen to form a saturated or unsaturated heterocyclic group which may substituted with a lower alkyl or a lower alkanoyl; said cycloalkyl, phenyl and phenyl(lower)alkyl may have on the cycloalkyl or phenyl ring one or two substituents selected from the group consisting of a lower alkoxy, a lower alkyl, a halogen, an N,N-di(lower)alkylamino, nitro, aminosulfonyl, hydroxy and a lower alkanoyloxy, or a pharmaceutically acceptable salt thereof.

The compounds of the formulae [I] and [I'] of the present invention have prophylactic or therapeutic activities against peptic and/or duodenal ulcers, particularly stress ulcers, indomethacin-induced ulcers and acetic acid-induced ulcers, with less side effects, such as central nervous system activities, anticholinergic activity and the rate of gastric empting, and are useful as a medicine for treating such ulcers. The compounds also have anti-inflammatory activity and are useful as an anti-inflammatory drug.

In the present specification, the term "lower alkyl" denotes a straight or branched alkyl group having 1 to 6 carbon atoms and includes, for example, methyl, ethyl, propyl, isopropyl, butyl, tertbutyl, pentyl, and hexyl. The term "cycloalkyl" denotes a cycloalkyl group having 3 to 12 carbon atoms and includes, for example, cyclopropyl, cyclobutyl, cyclopentyl, cyclohexyl, cycloheptyl, cyclooctyl, cyclononyl, cyclodecanyl, cycloundecanyl, and cyclododecanyl. The term "lower alkylenethio" denotes a group formed by combining a straight or branched lower alkylene having 1 to 6 carbon atoms and a sulfur atom, wherein one terminal carbon atom of the lower alkylene is bonded to the carbon atom at 5-position of tetrazole ring and another terminal sulfur atom is bonded to the carbon atom at the terminal of the lower alkylene group "B" and includes, for example, methylenethio, ethylenethio, trimethylenethio, tetramethylenethio, pentamethylenethio, hexamethylenethio, 2-methyltrimethylenethio, 2,2-dimethyltrimethylenethio, and 1-methyltrimethylenethio. The term "lower alkylene" denotes a straight or branched alkylene having 1 to 6 carbon atoms and includes, for example, methylene, ethylene, trimethylene, tetramethylene, pentamethylene, hexamethylene, methylmethylene, 2-methyltrimethylene, 2,2-dimethyltrimethylene, and 1-methyltrimethylene.

The term "cycloalkyl(lower)alkyl" denotes a group formed by combining a straight or branched alkylene having 1 to 6 carbon atoms with a cycloalkyl having 3 to 8 carbon atoms and includes, for example, cyclopropylmethyl, cyclobutylmethyl, cyclopentylmethyl, cyclohexylmethyl, cycloheptylmethyl, cyclooctylmethyl, 2-cyclohexylethyl, 1-cyclohexylethyl, 3-cyclohexylpropyl, 1,1-dimethyl-2-cyclohexylethyl, 4-cyclohexylbutyl, 5-cyclohexylpentyl, and 6-cyclohexylhexyl. The term "phenyl(lower)alkyl" denotes a group formed by combining a straight or branched lower alkylene having 1 to 6 carbon atoms with a phenyl group and includes, for example, benzyl, 1-phenylethyl, 2-phenylethyl, 3-phenylpropyl, 4-phenylbutyl, 1,1-dimethyl-2-phenylethyl, 5-phenylpentyl, and 6-phenylhexyl. The term "hydroxy(lower)alkyl" denotes a group formed by combining a straight or branched lower alkyl having 1 to 6 carbon atoms with a hydroxy group and includes, for example, hydroxymethyl, 2-hydroxyethyl, 3-hydroxypropyl, 2-hydroxypropyl, 4-hydroxybutyl, 1,1-dimethyl-2-hydroxyethyl, 5-hydroxypentyl, and 6-hydroxyhexyl.

The term "heterocyclic group" denotes a 5- or 6-membered saturated or unsaturated heterocyclic group containing one or two hetero atoms selected from the group consisting of nitrogen, oxygen and sulfur and includes, for example, pyridyl, pyrrolyl, pyrrolidinyl, 3-pyrrolinyl, dihydropyridyl, piperidinyl, 2-pyrazolinyl, 2-imidazolinyl, imidazolyl, imidazolidinyl, pyrazolyl, pyrimidinyl, pyridazinyl, pyrazinyl, piperazinyl, oxazolyl, oxazolidinyl, isoxazolyl, 4H-1,4-oxazinyl, morpholinyl, thiazolyl, thiazolidinyl, isothiazolyl, 4H-1,4-thiazinyl, furyl, tetrahydrofuryl, 2H-pyranyl, 4H-pyranyl, 3,4-dihydro-2H-pyranyl, tetrahydropyranyl, thienyl, tetrahydrothienyl, thianyl, and 1,4-dithianyl.

The term "lower alkyl substituted by said saturated or unsaturated heterocyclic group" denotes a group formed by combining a straight or branched alkylene having 1 to 6 carbon atoms with a 5- or 6-membered saturated or unsaturated heterocyclic group containing one or two hetero atoms selected from the group consisting of nitrogen, oxygen and sulfur and includes, for example, 2-pyridylmethyl, 2-(3-pyridyl)ethyl, 4-(4-pyridyl)butyl, 2-thienylmethyl, 2-(3-thienyl)ethyl, 2-pyrimidinylmethyl, 2-tetrahydropyranylmethyl, 3-pyrrolylmethyl, 2-(2-pyrrolyl)ethyl, 3-pyrrolidinylmethyl, 2-(2-pyrrolidinyl)ethyl, 2-(3-pyrrolinyl)methyl, 4-piperidinylmethyl, 2-(2-piperidinyl)ethyl, 4-dihydropyridylmethyl, 3-piperidinylmethyl, piperidinomethyl, 2-pyrazinylmethyl, 3-pyrazolylmethyl, 2-(4-pyrazolyl)ethyl, 2-imidazolylmethyl, 4-(2-imidazolyl)butyl, 2-(4-imidazolyl)ethyl, 2-imidazolidinylmethyl, 3-(4-imidazolidinyl)propyl, 3-pyridazinylmethyl, 2-(4-pyridazinyl)ethyl, 2-pyrazinylmethyl, 4-(2-pyrazinyl)-butyl, 2-(4-pyrimidinyl)ethyl, 6-(2-pyrimidinyl)hexyl, 2-pyrimidinylmethyl, 4-piperazinylmethyl, 3-(2-piperazinyl)propyl, piperazinomethyl, 2-oxazolylmethyl, 2-(4-oxazolyl)ethyl, 2-oxazolidinylmethyl, 4-isoxazolylmethyl, 2-(4H-1,4-oxazinyl)methyl, 3-morpholinylmethyl, morpholinomethyl, 2-thiazolylmethyl, 4-(4-thiazolyl)butyl, 2-thiazolidinylmethyl, 2-(4-thiazolidinyl)ethyl, 3-isothiazolylmethyl, 2-(4H-1,4-thiazinyl)methyl, furfuryl, 2-(3-furyl)-ethyl, 2-tetrahydrofurylmethyl, 2H-pyran-2-ylmethyl, 2H-pyran-4-ylmethyl, 4H-pyran-4-ylmethyl, 4H-pyran-3-ylmethyl, 2-(2-tetrahydropyranyl)ethyl, 2-(3-tetrahydropyranyl)ethyl, 4-(4-tetrahydropyranyl)butyl, 2-thienylmethyl, 2-( 3-thienyl)ethyl, 2-(2-tetrahydrothienyl)ethyl, 3-thienylmethyl, 2-thianylmethyl, 2-(3-thianyl)ethyl, 4-thianylmethyl, and 1,4-dithian-2ylmethyl.

The "saturated or unsaturated heterocyclic group formed by combining the groups R³ and R⁴ together with the nitrogen atom to which they are joined with or without being intervened with oxygen or nitrogen" is a 5- or 6-membered saturated or unsaturated heterocyclic group and includes, for example, piperidino, pyrrolidino, piperazino, morpholino, 1-imidazolyl, 1-pyrazolyl, 4,5-dihydropyrazol-1-yl, 1-pyrrolyl, 4H-1,4-oxazin-4-yl, and 3-tetrahydrooxazolyl.

The term "lower alkoxy" donotes a straight or branched alkoxy group having 1 to 6 carbon atoms and includes, for example, methoxy, ethoxy propoxy, isopropoxy, butoxy, tert-butoxy, pentyloxy, and hexyloxy. The term "halogen" includes fluorine, chlorine, bromine, and iodine. The term "N,N-di(lower)alkylamino" denotes an N,N-dialkylamino having 1 to 6 carbon atoms in each alkyl moiety and includes, for example, N,N-dimethylamino, N,N-diethylamino, N-methyl-N-ethylamino, N,N-dipropylamino, N,N-diisopropylamino, N,N-dibutylamino, N-methyl-N-tert-butylamino, N,N-dipentylamino, and N,N-dihexylamino. The term "lower alkanoyloxy" denotes an alkanoyloxy group having 1 to 6 carbon atoms and includes, for example, acetyloxy, propionyloxy, butyryloxy, isobutyryloxy, pentanoyloxy, and hexanoyloxy. The term "lower alkanoyl" denotes an alkanoyl group having 1 to 6 carbon atoms and includes, for example, acetyl, propionyl, butyryl, isobutyryl, pentanoyl, and hexanoyl. The cycloalkyl, phenyl and phenyl(lower)alkyl having on the cycloalkyl or phenyl ring one or two substituents selected from the group consisting of a lower alkoxy, a lower alkyl, a halogen, an N,N-di(lower)alkylamino, nitro, aminosulfonyl, hydroxy or a lower alkanoyloxy include, for example, 2-hydroxycyclohexyl, 3-hydroxycyclohexyl, 4-hydroxycyclohexyl, 2,5-dihydroxycyclohexyl, 3,4-dihydroxycyclohexyl, 2-hydroxycyclopentyl, 4-hydroxycyclooctyl, 2-acetyloxycyclohexyl, 4-butyryloxycyclohexyl, 3,4-diacetyloxycyclohexyl, 2-methylcyclohexyl, 3-ethylcyclohexyl, 4-tert-butylcyclohexyl, 3,4-dimethylcyclohexyl, 2,5-dimethylcyclohexyl, 2-methoxycyclohexyl, 3-methoxycyclohexyl, 4-methoxycyclohexyl, 3,4-dimethoxycyclohexyl, 2,5-dimethoxycyclohexyl, 4-tert-butoxycyclohexyl, 3-methylcycloheptyl, 2-chlorocyclohexyl, 3-fluorocyclohexyl, 4-bromocyclohexyl, 3,4-difluorocyclohexyl, 2,5-dichlorocyclohexyl, 4-(N,N-dimethylamino)cyclohexyl, 3-(N,N-diethylamino)cyclohexyl, 2-nitrocyclohexyl, 3-nitrocyclooctyl, 4-nitrocyclohexyl, 3,5-dinitrocyclohexyl, 2-aminosulfonylcyclohexyl, 4-aminosulfonylcyclohexyl, 2-hydroxy-3-chlorocyclohexyl, 2-methyl-3-chlorocyclohexyl, 2-hydroxyphenyl, 3-hydroxyphenyl, 4-hydroxyphenyl, 2,5-dihydroxyphenyl, 3,4-dihydroxyphenyl, 2-acetyloxyphenyl, 4-isobutyryloxyphenyl, 3,4-diacetyloxyphenyl, 2-methylphenyl, 3-methylphenyl, 4-ethylphenyl, 3,4-dimethylphenyl, 2,5-diethylphenyl, 2-methoxyphenyl, 3-methoxyphenyl, 4-methoxyphenyl, 3,4-dimethoxyphenyl, 2,5-diethoxyphenyl, 4-isopropoxyphenyl, 2-chlorophenyl, 3-bromophenyl, 4-fluorophenyl, 2,5-dichlorophenyl, 3,4-dichlorophenyl, 4-(N,N-dimethylamino)phenyl, 2-(N,N-dimethylamino)phenyl, 3-(N,N-diethylamino)phenyl, 2-nitrophenyl, 3-nitrophenyl, 4-nitrophenyl, 2,4-dinitrophenyl, 2-aminosulfonylphenyl, 4-aminosulfonylphenyl, 2-hydroxy-3-chlorophenyl, 4-methoxy-2-chlorophenyl, 2-methyl-3-chlorophenyl, 2-hydroxybenzyl, 2-(4-hydroxyphenyl)ethyl, 4-(3-hydroxyphenyl)butyl, 2-(3,4-dihydroxyphenyl)ethyl, 1-(2,5-dihydroxyphenyl)ethyl, 2-acetyloxybenzyl, 2-(3-acetyloxyphenyl)ethyl, 2-(3,4-diacetyloxyphenyl)ethyl, 1,1-dimethyl-2-(3,4-diacetyloxyphenyl)ethyl, 2-methylbenzyl, 2-(4-methylphenyl)ethyl, 2-(3,4dimethylphenyl)ethyl, 6-(2,5-dimethylphenyl)hexyl, 2-chlorobenzyl, 3-fluorobenzyl, 4-bromobenzyl, 2-(2-chlorophenyl)ethyl, 1-(4-chlorophenyl)ethyl, 2-(3,4-dichlorophenyl)ethyl, 5-(2,5-dichlorophenyl)pentyl, 4-(N,N-dimethylamino)benzyl, 2-[2-(N,N-dimethylamino)phenyl]ethyl, 2-nitrobenzyl, 2-(2,4-dinitrophenyl)ethyl, 1-(4-nitrophenyl)ethyl, 2-aminosulfonylbenzyl, 3-aminosulfonylbenzyl, 4-aminosulfonylbenzyl, 2-(4-aminosulfonylphenyl)ethyl, 2-hydroxy-3-chlorobenzyl, 4-methoxy-2-chlorobenzyl, 2-(2-methyl-3-chlorophenyl)ethyl, 2-methoxybenzyl, 4-methoxybenzyl, 2-(3,4-dimethoxyphenyl)ethyl, 1-(3,4-dimethoxyphenyl)ethyl, 2-(2,5-diethoxyphenyl)ethyl, 1,1-dimethyl-2-(3,4-dimethoxyphenyl)ethyl, and 6-(3,4-dimethoxyphenyl)hexyl.

Representative compounds of the present invention are as follows.

N-Ethyl-N-cyclohexyl-4-(1-methyl-1,2,3,4-tetrazol-5-yl)thio-butyramide

N-Butyl-N-cyclooctyl-4-(1-methyl-1,2,3,4-tetrazol-5-yl)thio-butyramide

N-Methyl-N-cyclopentyl-4-(1-methyl-1,2,3,4-tetrazol-5-yl)thio-butyramide

N-Isopropyl-N-cyclohexyl-4-(1-methyl-1,2,3,4-tetrazol-5-yl)thio-butyramide

N-Hexyl-N-cyclohexyl-4-(1-methyl-1,2,3,4-tetrazol-5-yl)thio-butyramide

N-Methyl-N-cyclododecanyl-4-(1-methyl-1,2,3,4-tetrazol-5-yl)thio-butyramide

N-Methyl-N-cyclohexyl-4-(1-ethyl-1,2,3,4-tetrazol-5-yl)thio-butyramide

N-Ethyl-N-cyclohexyl-4-(1-tert-butyl-1,2,3,4-tetrazol-5-yl)thio-butyramide

N-Methyl-N-cyclohexyl-4-(1-hexyl-1,2,3,4-tetrazol-5-yl)thio-butyramide

N-Cyclohexyl-4-(1-methyl-1,2,3,4-tetrazol-5-yl)thio-butyramide

N-Cyclododecanyl-4-(1-methyl-1,2,3,4-tetrazol-5-yl)thio-butyramide

N-Methyl-N-cyclohexyl-3-(1-methyl-1,2,3,4-tetrazol-5-yl)thio-propionamide

N-Methyl-N-cyclohexyl-2-(1-methyl-1,2,3,4-tetrazol-5-yl)thio-acetamide

N-Methyl-N-cyclohexyl-5-(1-methyl-1,2,3,4-tetrazol-5-yl)thio-valeramide

N-Methyl-N-cyclohexyl-7-(1-methyl-1,2,3,4-tetrazol-5-yl)thio-heptanamide

N-Methyl-N-cyclohexyl-4-(1-methyl-1,2,3,4-tetrazol-5-yl)thio-3-methylbutyramide

N-Ethyl-N-cyclohexyl-4-(1-ethyl-1,2,3,4-tetrazol-5-yl)thio-3,3-dimethylbutyramide

N-Ethyl-N-cyclohexyl-4-(1-cyclohexyl-1,2,3,4-tetrazol-5-yl)thio-butyramide

N-Ethyl-N-cyclohexyl-4-(1-cyclooctyl-1,2,3,4-tetrazol-5-yl)thio-butyramide

N-Cyclohexyl-4-(1-cyclohexyl-1,2,3,4-tetrazol-5-yl)thio-butyramide

N-Methyl-N-cyclohexyl-3-(1-cyclohexyl-1,2,3,4-tetrazol-5-yl)thio-propionamide

N-Methyl-N-cyclohexyl-4-(1-cyclohexyl-1,2,3,4-tetrazol-5-yl)thio-3-methylbutyramide

N-Methyl-N-cyclohexyl-4-(1-phenyl-1,2,3,4-tetrazol-5-yl)thio-butyramide

N-Ethyl-N-cyclohexyl-3-(1-phenyl-1,2,3,4-tetrazol-5-yl)thio-propionamide

N-Methyl-N-cyclohexyl-4-(1-phenyl-1,2,3,4-tetrazol-5-yl)thio-3-methylbutyramide

N,N-Dicyclohexyl-4-(1-methyl-1,2,3,4-tetrazol-5-yl)thio-butyramide

N-Cyclohexyl-N-cyclooctyl-4-(1-methyl-1,2,3,4-tetrazol-5-yl)thio-butyramide

N,N-Dicyclohexyl-5-(1-phenyl-1,2,3,4-tetrazol-5-yl)thio-valeramide

N,N-Dicyclohexyl-4-(1-cyclohexyl-1,2,3,4-tetrazol-5-yl)thio-butyramide

N-Ethyl-N-cyclohexyl-4-[1-(4-hydroxycyclohexyl)-1,2,3,4-tetrazol-5-yl]thio-butyramide

N-Methyl-N-cyclohexyl-4-[1-(3,4-dihydroxycyclohexyl)-1,2,3,4-tetrazol-5-yl]thio-butyramide

N-Methyl-N-cyclohexyl-4-[1-(4-acetyloxycyclohexyl)-1,2,3,4-tetrazol-5-yl]thio-butyramide

N-Methyl-N-cyclohexyl-4-[1-(4-methylcyclohexyl)-1,2,3,4-tetrazol-5-yl]thio-butyramide

N-Methyl-N-cyclohexyl-4-[1-(2,5-dimethylcyclohexyl)-1,2,3,4-tetrazol-5-yl]thio-butyramide

N-Methyl-N-cyclohexyl-4-[1-(2-methoxycyclohexyl)-1,2,3,4-tetrazol-5-yl]thio-butyramide

N-Cyclohexyl-4-[1-(4-methoxycyclohexyl)-1,2,3,4-tetrazol-5-yl]thio-butyramide

N-Methyl-N-cyclohexyl-4-[1-(3,4-dimethoxycyclohexyl)-1,2,3,4-tetrazol-5-yl]thio-butyramide

N-Methyl-N-cyclohexyl-4-[1-(2-chlorocyclohexyl)-1,2,3,4-tetrazol-5-yl]thio-butyramide

N-Ethyl-N-cyclohexyl-4-[1-(3-fluorocyclohexyl)-1,2,3,4-tetrazol-5-yl]thio-butyramide

N-Ethyl-N-cyclohexyl-4-[1-(4-bromocyclohexyl)-1,2,3,4-tetrazol-5-yl]thio-butyramide

N-Methyl-N-cyclohexyl-4-[1-(2,5-dichlorocyclohexyl)-1,2,3,4-tetrazol-5-yl]thio-butyramide

N-Methyl-N-cyclohexyl-4-[1-(4-(N,N-dimethylamino)cyclohexyl)-1,2,3,4-tetrazol-5-yl]thio-butyramide

N-Ethyl-N-cyclohexyl-4-[1-(2-nitrocyclohexyl)-1,2,3,4-tetrazol-5-yl]thio-butyramide

N-Methyl-N-cyclohexyl-4-[1-(4-aminosulfonylcyclohexyl)-1,2,3,4-tetrazol-5-yl]thio-butyramide

N-Ethyl-N-(2-hydroxycyclohexyl)-4-(1-methyl-1,2,3,4-tetrazol-5-yl)thio-butyramide

N-Methyl-N-(3-hydroxycyclohexyl)-4-(1-methyl-1,2,3,4-tetrazol-5-yl)thio-butyramide

N-Ethyl-N-(4-hydroxycyclohexyl)-4-(1-methyl-1,2,3,4-tetrazol-5-yl)thio-butyramide

N-Methyl-N-(3,4-dihydroxycyclohexyl)-4-(1-methyl-1,2,3,4-tetrazol-5-yl)thio-butyramide

N-Ethyl-N-(4-hydroxycyclohexyl)-4-(1-cyclohexyl-1,2,3,4-tetrazol-5-yl)thio-butyramide

N-Methyl-N-(2-hydroxycyclohexyl)-4-(1-phenyl-1,2,3,4-tetrazol-5-yl)thio-butyramide

N-Methyl-N-(4-hydroxycyclohexyl)-4-[1-(4-hydroxycyclohexyl)-1,2,3,4-tetrazol-5-yl)thio-butyramide

N-(4-Hydroxycyclohexyl)-4-(1-methyl-1,2,3,4-tetrazol-5-yl)thio-butyramide

N-(2-Hydroxycyclohexyl)-4-(1-cyclohexyl-1,2,3,4-tetrazol-5-yl)thio-butyramide

N-(3-Hydroxycyclohexyl)-4-(1-phenyl-1,2,3,4-tetrazol-5-yl)thio-butyramide

N-Methyl-N-(4-acetyloxycyclohexyl)-4-(1-ethyl-1,2,3,4-tetrazol-5-yl)thio-butyramide

N-Ethyl-N-(3-acetyloxycyclohexyl)-4-(1-phenyl-1,2,3,4-tetrazol-5-yl)thio-butyramide

N-Ethyl-N-(3-acetyloxycyclohexyl)-4-(1-cyclohexyl-1,2,3,4-tetrazol-5-yl)thio-butyramide

N-Methyl-N-(3,4-diacetyloxycyclohexyl)-4-(1-methyl-1,2,3,4-tetrazol-5-yl)thio-butyramide

N-(2-Acetyloxycyclohexyl)-4-(1-cyclohexyl-1,2,3,4-tetrazol-5-yl)thio-butyramide

N,N-Di(4-hydroxycyclohexyl)-4-(1-methyl-1,2,3,4-tetrazol-5-yl)thio-butyramide

N-Methyl-N-(2-methylcyclohexyl)-4-(1-methyl-1,2,3,4-tetrazol-5-yl)thio-butyramide

N-Ethyl-N-(4-methylcyclohexyl)-4-(1-cyclohexyl-1,2,3,4-tetrazol-5-yl)thio-butyramide

N-Methyl-N-(3-methylcyclohexyl)-4-(1-phenyl-1,2,3,4-tetrazol-5-yl)thio-butyramide

N-Methyl-N-(3,4-dimethylcyclohexyl)-4-(1-methyl-1,2,3,4-tetrazol-5-yl)thio-butyramide

N-Methyl-N-(4-methoxycyclohexyl)-4-(1-methyl-1,2,3,4-tetrazol-5-yl)thio-butyramide

N-Ethyl-N-(2-methoxycyclohexyl)-4-(1-cyclohexyl-1,2,3,4-tetrazol-5-yl)thio-butyramide

N-Methyl-N-(3-methoxycyclohexyl)-4-(1-phenyl-1,2,3,4-tetrazol-5-yl)thio-butyramide

N-Methyl-N-(3,4-dimethoxycyclohexyl)-4-(1-methyl-1,2,3,4-tetrazol-5-yl)thio-butyramide

N-(4-Methoxycyclohexyl)-4-(1-cyclohexyl-1,2,3,4-tetrazol-5-yl)thio-butyramide

N-Methyl-N-(4-methoxycyclohexyl)-4-[1-(4-hydroxycyclohexyl)-1,2,3,4-tetrazol-5-yl]thio-butyramide

N,N-Di(4-methoxycyclohexyl)-4-(1-methyl-1,2,3,4-tetrazol-5-yl)thio-butyramide

N-Methyl-N-(2-chlorocyclohexyl)-4-(1-methyl-1,2,3,4-tetrazol-5-yl)thio-butyramide

N-Methyl-N-(3-fluorocyclohexyl)-4-(1-cyclohexyl-1,2,3,4-tetrazol-5-yl)thio-butyramide

N-Methyl-N-(4-bromocyclohexyl)-4-(1-phenyl-1,2,3,4-tetrazol-5-yl)thio-butyramide

N-Methyl-N-(3,4-dichlorocyclohexyl)-4-(1-methyl-1,2,3,4-tetrazol-5-yl)thio-butyramide

N-Methyl-N-[4-(N,N-dimethylamino)cyclohexyl]-4-(1-methyl-1,2,3,4-tetrazol-5-yl)thio-butyramide

N-Methyl-N-(4-nitrocyclohexyl)-4-(1-methyl-1,2,3,4-tetrazol-5-yl)thio-butyramide

N-Methyl-N-(4-aminosulfonylcyclohexyl)-4-(1-methyl-1,2,3,4-tetrazol-5-yl)thio-butyramide

N-Methyl-N-(2-hydroxy-3-chlorocyclohexyl)-4-(1-methyl-1,2,3,4-tetrazol-5-yl)thio-butyramide

N-Methyl-N-(2-hydroxyphenyl)-4-(1-methyl-1,2,3,4-tetrazol-5-yl)thio-butyramide

N-(4-Hydroxyphenyl)-4-(1-methyl-1,2,3,4-tetrazol-5-yl)thio-butyramide

N-Methyl-N-(2-acetyloxyphenyl)-4-(1-methyl-1,2,3,4-tetrazol-5-yl)thio-butyramide

N-Ethyl-N-phenyl-4-(1-methyl-1,2,3,4-tetrazol-5-yl)thio-butyramide

N-Methyl-N-phenyl-4-(1-phenyl-1,2,3,4-tetrazol-5-yl)thio-butyramide

N-Methyl-N-phenyl-4-(1-cyclohexyl-1,2,3,4-tetrazol-5-yl)thio-butyramide

N-Phenyl-4-(1-phenyl-1,2,3,4-tetrazol-5-yl)thio-butyramide

N-Methyl-N-phenyl-5-(1-methyl-1,2,3,4-tetrazol-5-yl)thio-valeramide

N-Methyl-N-(2-methylphenyl)-4-(1-methyl-1,2,3,4-tetrazol-5-yl)thio-butyramide

N-(2-Methyl-3-chlorophenyl)-4-(1-methyl-1,2,3,4-tetrazol-5-yl)thio-butyramide

N-Ethyl-N-(2-methylphenyl)-4-[1-(3,4-dihydroxyphenyl)-1,2,3,4-tetrazol-5-yl]thio-butyramide

N-Methyl-N-(2,5-dimethylphenyl)-4-(1-methyl-1,2,3,4-tetrazol-5-yl)thio-butyramide

N-Methyl-N-(2-methoxyphenyl)-4-(1-methyl-1,2,3,4-tetrazol-5-yl)thio-butyramide

N-Methyl-N-(3-methoxyphenyl)-5-(1-phenyl-1,2,3,4-tetrazol-5-yl)thio-valeramide

N-Methyl-N-(3,4-dimethoxyphenyl)-4-(1-methyl-1,2,3,4-tetrazol-5-yl)thio-butyramide

N-Methyl-N-(3,4-dimethoxyphenyl)-4-[1-(4-hydroxycyclohexyl)-1,2,3,4-tetrazol-5-yl]thio-butyramide

N-(2-Methoxyphenyl)-4-(1-methyl-1,2,3,4-tetrazol-5-yl)thio-butyramide

N-(3,4-Dimethoxyphenyl)-4-(1-methyl-1,2,3,4-tetrazol-5-yl)thio-butyramide

N-Methyl-N-(2-chlorophenyl)-4-(1-methyl-1,2,3,4-tetrazol-5-yl)thio-butyramide

N-Methyl-N-(4-fluorophenyl)-4-(1-phenyl-1,2,3,4-tetrazol-5-yl)thio-butyramide

N-(4-Chlorophenyl)-4-(1-methyl-1,2,3,4-tetrazol-5-yl)thio-butyramide

N-[4-(N,N-Dimethylamino)phenyl]-4-(1-methyl-1,2,3,4-tetrazol-5-yl)thio-butyramide

N-(4-Nitrophenyl)-4-(1-methyl-1,2,3,4-tetrazol-5-yl)thio-butyramide

N-(4-Aminosulfonylphenyl)-4-(1-methyl-1,2,3,4-tetrazol-5-yl)thio-butyramide

N-Methyl-N-cyclohexyl-4-[1-(4-hydroxyphenyl)-1,2,3,4-tetrazol-5-yl]thio-butyramide

N-Methyl-N-cyclohexyl-4-[1-(2-methoxyphenyl)-1,2,3,4-tetrazol-5-yl]thio-butyramide

N-Ethyl-N-cyclohexyl-4-[1-(4-chlorophenyl)-1,2,3,4-tetrazol-5-yl]thio-butyramide

N-Methyl-N-cyclohexyl-4-[1-(4-N,N-dimethylamino)phenyl-1,2,3,4-tetrazol-5-yl]thio-butyramide

N-Methyl-N-cyclohexyl-4-[1-(4-aminosulfonylphenyl)-1,2,3,4-tetrazol-5-yl]thio-butyramide

N-Methyl-N-cyclohexyl-4-[1-(4-nitrophenyl)-1,2,3,4-tetrazol-5-yl]thio-butyramide

N,N-Dimethyl-4-(1-methyl-1,2,3,4-tetrazol-5-yl)thio-butyramide

N,N-Diethyl-4-(1-methyl-1,2,3,4-tetrazol-5-yl)thio-butyramide

N,N-Diisopropyl-4-(1-methyl-1,2,3,4-tetrazol-5-yl)thio-butyramide

N,N-Dihexyl-4-(1-methyl-1,2,3,4-tetrazol-5-yl)thio-butyramide

N-Methyl-N-ethyl-4-(1-methyl-1,2,3,4-tetrazol-5-yl)thio-butyramide

N,N-Diethyl-5-(1-ethyl-1,2,3,4-tetrazol-5-yl)thio-valeramide

N,N-Dimethyl-4-(1-methyl-1,2,3,4-tetrazol-5-yl)thio-3-methylbutyramide

N,N-Diethyl-4-(1-cyclohexyl-1,2,3,4-tetrazol-5-yl)thio-butyramide

N,N-Dimethyl-4-(1-phenyl-1,2,3,4-tetrazol-5-yl)thio-butyramide

N,N-Diethyl-4-[1-(4-hydroxycyclohexyl)-1,2,3,4-tetrazol-5-yl]thio-butyramide

N,N-Diethyl-3-[1-(2-hydroxyphenyl)-1,2,3,4-tetrazol-5-yl]thio-propionamide

N,N-Diethyl-4-[1-(3,4-dimethoxyphenyl)-1,2,3,4-tetrazol-5-yl]thio-butyramide

N,N-Dimethyl-4-[1-(4-methylcyclohexyl)-1,2,3,4-tetrazol-5-yl]thio-butyramide

N,N-Diethyl-4-[1-(2-chlorophenyl)-1,2,3,4-tetrazol-5-yl]thio-butyramide

N,N-Dimethyl-4-[1-(4-chlorocyclohexyl)-1,2,3,4-tetrazol-5-yl]thio-butyramide

N-tert-Butyl-4-(1-phenyl-1,2,3,4-tetrazol-5-yl)thio-butyramide

N-Ethyl-4-[1-(3,4-dimethoxyphenyl)-1,2,3,4-tetrazol-5-yl]thio-butyramide

4-(1-Methyl-1,2,3,4-tetrazol-5-yl)thio-butyramide

4-(1-Cyclohexyl-1,2,3,4-tetrazol-5-yl)thio-butyramide

N-Ethyl-N-cyclohexylmethyl-4-(1-methyl-1,2,3,4-tetrazol-5-yl)thio-butyramide

N-Ethyl-N-(2-cyclohexylethyl)-4-(1-cyclohexyl-1,2,3,4-tetrazol-5-yl)thio-butyramide

N-Methyl-N-cyclooctylmethyl-4-(1-phenyl-1,2,3,4-tetrazol-5-yl)thio-butyramide

N-Cyclohexylmethyl-4-(1-methyl-1,2,3,4-tetrazol-5-yl)thio-butyramide

N-Phenyl-N-cyclohexylmethyl-4-(1-methyl-1,2,3,4-tetrazol-5-yl)thio-butyramide

N,N-Dicyclohexylmethyl-4-(1-cyclohexyl-1,2,3,4-tetrazol-5-yl)thio-butyramide

N-Cyclohexyl-N-cyclohexylmethyl-4-(1-methyl-1,2,3,4-tetrazol-5-yl)thio-butyramide

N-Methyl-N-cyclohexylmethyl-4-[1-(4-hydroxycyclohexyl)-1,2,3,4-tetrazol-5-yl]thio-butyramide

N-Cyclohexylmethyl-N-(4-hydroxycyclohexyl)-4-(1-methyl-1,2,3,4-tetrazol-5-yl)thio-butyramide

N-Ethyl-N-benzyl-4-(1-methyl-1,2,3,4-tetrazol-5-yl)thio-butyramide

N,N-Dibenzyl-4-(1-methyl-1,2,3,4-tetrazol-5-yl)thio-butyramide

N-Methyl-N-benzyl-4-(1-cyclohexyl-1,2,3,4-tetrazol-5-yl)thio-butyramide

N-Ethyl-N-benzyl-4-(1-phenyl-1,2,3,4-tetrazol-5-yl)thio-butyramide

N-(1-Phenylethyl)-4-(1-methyl-1,2,3,4-tetrazol-5-yl)thio-butyramide

N-Cyclohexyl-N-benzyl-4-(1-methyl-1,2,3,4-tetrazol-5-yl)thio-butyramide

N-Phenyl-N-benzyl-4-(1-phenyl-1,2,3,4-tetrazol-5-yl)thio-butyramide

N-Methyl-N-benzyl-4-[1-(4-hydroxycyclohexyl)-1,2,3,4-tetrazol-5-yl]thio-butyramide

N-Ethyl-N-benzyl-4-[1-(3,4-dimethoxyphenyl)-1,2,3,4-tetrazol-5-yl]thio-butyramide

N-Ethyl-N-[2-(3,4-dimethoxyphenyl)ethyl]-4-(1-methyl-1,2,3,4-tetrazol-5-yl)thio-butyramide

N-Benzyl-N-[2-(3,4-dimethoxyphenyl)ethyl]-4-(1-methyl-1,2,3,4-tetrazol-5-yl)thio-butyramide

N-Methyl-N-[2-(4-methoxyphenyl)ethyl]-4-(1-methyl-1,2,3,4-tetrazol-5-yl)thio-butyramide

N-Methyl-N-[2-(3,4-dihydroxyphenyl)ethyl]-4-(1-methyl-1,2,3,4-tetrazol-5-yl)thio-butyramide

N-Cyclohexyl-N-(2-hydroxybenzyl)-4-(1-cyclohexyl-1,2,3,4-tetrazol-5-yl)thio-butyramide

N-Methyl-N-(2-acetyloxybenzyl)-4-(1-methyl-1,2,3,4-tetrazol-5-yl)thio-butyramide

N-Ethyl-N-[2-(3,4-diacetyloxyphenyl)ethyl]-4-(1-cyclohexyl-1,2,3,4-tetrazol-5-yl)thio-butyramide

N-Ethyl-N-(2-chlorobenzyl)-4-(1-methyl-1,2,3,4-tetrazol-5-yl)thio-butyramide

N-Cyclohexyl-N-[2-(3,4-dichlorophenyl)ethyl]-4-(1-methyl-1,2,3,4-tetrazol-5-yl)thio-butyramide

N-Methyl-N-(2-methylbenzyl)-5-(1-methyl-1,2,3,4-tetrazol-5-yl)thio-butyramide

N-Methyl-N-[2-(4-(N,N-dimethylamino)phenyl)ethyl]-4-(1-methyl-1,2,3,4-tetrazol-5-yl)thio-butyramide

N-Methyl-N-cyclohexyl-4-(1,2,3,4-tetrazol-5-yl)thio-butyramide N,N-Dicyclohexyl-4-(1,2,3,4-tetrazol-5-yl)thio-butyramide

N-Methyl-N-phenyl-4-(1,2,3,4-tetrazol-5-yl)thio-butyramide

N-Methyl-N-cyclohexylmethyl-3-(1,2,3,4-tetrazol-5-yl)thio-propionamide

N,N-Dicyclohexylmethyl-4-(1,2,3,4-tetrazol-5-yl)thio-butyramide

N-Methyl-N-benzyl-4-(1,2,3,4-tetrazol-5-yl)thio-butyramide

4-(1,2,3,4-Tetrazol-5-yl)thio-butyramide

N-(2-Hydroxyethyl)-4-(1-methyl-1,2,3,4-tetrazol-5-yl)thio-butyramide

N-Cyclohexyl-N-(2-hydroxyethyl)-4-(1-methyl-1,2,3,4-tetrazol-5-yl)thio-butyramide

N-Methyl-N-(2-hydroxyethyl)-4-(1-methyl-1,2,3,4-tetrazol-5-yl)thio-butyramide

N-Cyclohexyl-N-(2-hydroxyethyl)-4-(1-cyclohexyl-1,2,3,4-tetrazol-5-yl)thio-butyramide

N-Ethyl-N-(2-hydroxyethyl)-4-(1-phenyl-1,2,3,4-tetrazol-5-yl)thio-butyramide

N-Phenyl-N-(2-hydroxyethyl)-4-(1-methyl-1,2,3,4-tetrazol-5-yl)thio-butyramide

N-Methyl-N-(4-hydroxybutyl)-4-(1-methyl-1,2,3,4-tetrazol-5-yl)thio-butyramide

N,N-Di(2-hydroxyethyl)-4-(1-methyl-1,2,3,4-tetrazol-5-yl)thio-butyramide

N-(2-Hydroxyethyl)-N-(4-hydroxycyclohexyl)-4-(1-methyl-1,2,3,4-tetrazol-5-yl)thio-butyramide

N-(2-Hydroxyethyl)-N-benzyl-4-(1-methyl-1,2,3,4-tetrazol-5-yl)thio-butyramide

N-(2-Hydroxyethyl)-N-cyclohexylmethyl-4-(1-cyclohexyl-1,2,3,4-tetrazol-5-yl)thio-butyramide

N-(2-Hydroxyethyl)-N-[2-(3,4-dimethoxyphenyl)ethyl]-4-(1-methyl-1,2,3,4-tetrazol-5-yl)thio-butyramide

5-(3-Morpholinocarbonylpropylthio)-1-methyl-1,2,3,4-tetrazole

5-(3-Piperidinocarbonylpropylthio)-1-methyl-1,2,3,4-tetrazole

5-(4-Pyrrolidinocarbonylbutylthio)-1-methyl-1,2,3,4-tetrazole

5-(3-Piperazinocarbonylpropylthio)-1-cyclohexyl-1,2,3,4-tetrazole

5-[3-(1-Imidazolyl)carbonylpropylthio]-1-methyl-1,2,3,4-tetrazole

5-[3-(1-Pyrazolyl)carbonylpropylthio]-1-methyl-1,2,3,4-tetrazole

5-[3-(1-pyrrolyl)carbonylpropylthio]-1-methyl-1,2,3,4-tetrazole

5-[3-(4-methylpiperazino)carbonylpropylthio]-1-methyl-1,2,3,4-tetrazole

5-[4-(1-Imidazolyl)carbonylbutylthio]-1-cyclohexyl-1,2,3,4-tetrazole

5-[3-(1-Pyrazolyl)carbonylpropylthio]-1-phenyl-1,2,3,4-tetrazole

5-[3-(4-Acetylpiperazino)carbonylpropylthio]-1-methyl-1,2,3,4-tetrazole

N-(2-Pyridyl)-4-(1-methyl-1,2,3,4-tetrazol-5-yl)thio-butyramide

N-Ethyl-N-(2-pyridyl)-4-(1-methyl-1,2,3,4-tetrazol-5-yl)thio-butyramide

N-Cyclohexyl-N-(4-pyridyl)-4-(1-methyl-1,2,3,4-tetrazol-5-yl)thio-butyramide

N-Methyl-N-(3-pyridyl)-4-(1-cyclohexyl-1,2,3,4-tetrazol-5-yl)thio-butyramide

N-Methyl-N-(2-pyridylmethyl)-4-(1-methyl-1,2,3,4-tetrazol-5-yl)thio-butyramide

N-Methyl-N-(2-pyrrolyl)-4-(1-methyl-1,2,3,4-tetrazol-5-yl)thio-butyramide

N-Methyl-N-(3-pyrrolidinylmethyl)-4-(1-phenyl-1,2,3,4-tetrazol-5-yl)thio-butyramide

N-(3-Pyrrolin-2-yl)-4-(1-methyl-1,2,3,4-tetrazol-5-yl)thio-butyramide

N-Methyl-N-(3-pyrrolin-2-ylmethyl)-4-(1-cyclohexyl-1,2,3,4-tetrazol-5-yl)thio-butyramide

N-Methyl-N-(2-piperidinyl)-4-(1-methyl-1,2,3,4-tetrazol-5-yl)thio-butyramide

N-Cyclohexyl-N-(4-piperidinylmethyl)-4-(1-cyclohexyl-1,2,3,4-tetrazol-5-yl)thio-butyramide

N-Methyl-N-(2-pyrazolin-4-yl)-4-(1-methyl-1,2,3,4-tetrazol-5-yl)thio-butyramide

N-Methyl-N-(2-imidazolyl)-4-(1-methyl-1,2,3,4-tetrazol-5-yl)thio-butyramide

N-Cyclohexyl-N-(2-imidazolylmethyl)-4-(1-methyl-1,2,3,4-tetrazol-5-yl)thio-butyramide

N-(2-Imidazolidinyl)-5-(1-methyl-1,2,3,4-tetrazol-5-yl)thio-valeramide

N-Cyclohexyl-N-(3-pyrazolylmethyl)-4-(1-methyl-1,2,3,4-tetrazol-5-yl)thio-butyramide

N-(2-Pyrimidinyl)-4-(1-methyl-1,2,3,4-tetrazol-5-yl)thio-butyramide

N-Cyclohexyl-N-(3-pyridazinylmethyl)-4-(1-cyclohexyl-1,2,3,4-tetrazol-5-yl)thio-butyramide

N-(2-Pyrazinyl)-4-(1-cyclohexyl-1,2,3,4-tetrazol-5-yl)thio-butyramide

N-Methyl-N-(2-pyradinylmethyl)-4-(1-methyl-1,2,3,4-tetrazol-5-yl)thio-butyramide

N-Cyclohexyl-N-(2-oxazolyl)-4-(1-cyclohexyl-1,2,3,4-tetrazol-5-yl)thio-butyramide

N-Methyl-N-(2-oxazolylmethyl)-4-(1-methyl-1,2,3,4-tetrazol-5-yl)thio-butyramide

N-Methyl-N-(4-isoxazolyl)-4-(1-methyl-1,2,3,4-tetrazol-5-yl)thio-butyramide

N-(2-Thiazolyl)-4-(1-methyl-1,2,3,4-tetrazol-5-yl)-thio-butyramide

N-Methyl-N-(2-furyl)-4-(1-cyclohexyl-1,2,3,4-tetrazol-5-yl)thio-butyramide

N-Furfuryl-4-(1-methyl-1,2,3,4-tetrazol-5-yl)thio-butyramide

N-Methyl-N-(2-tetrahydrofuryl)-4-(1-methyl-1,2,3,4-tetrazol-5-yl)thio-butyramide

N-Methyl-N-(2H-pyran-2-yl)-4-(1-methyl-1,2,3,4-tetrazol-5-yl)thio-butyramide

N-Methyl-N-(2-tetrahydropyranylmethyl)-4-(1-methyl-1,2,3,4-tetrazol-5-yl)thio-butyramide

N-(2-Thienyl)-4-(1-phenyl-1,2,3,4-tetrazol-5-yl)thio-butyramide

N-Methyl-N-(2-thienylmethyl)-4-(1-methyl-1,2,3,4-tetrazol-5-yl)thio-butyramide

N-Methyl-N-(4-thianyl)-4-(1-methyl-1,2,3,4-tetrazol-5-yl)thio-butyramide

N-Ethyl-N-cyclohexyl-5-(1-methyl-1,2,3,4-tetrazol-5-yl)valeramide

N-Butyl-N-cyclooctyl-5-(1-methyl-1,2,3,4-tetrazol-5-yl)valeramide

N-Ethyl-N-cyclohexyl-4-(1-tert-butyl-1,2,3,4-tetrazol-5-yl)butyramide

N-Methyl-N-cyclohexyl-7-(1-methyl-1,2,3,4-tetrazol-5-yl)heptanamide

N-Methyl-N-cyclohexyl-4-(1-methyl-1,2,3,4-tetrazol-5-yl)-3-methylbutyramide

N-Methyl-N-cyclohexyl-4-(1-cyclotridecanyl-1,2,3,4-tetrazol-5-yl)butyramide

N-Ethyl-N-cyclohexyl-5-(1-cyclohexyl-1,2,3,4-tetrazol-5-yl)valeramide

N-Ethyl-N-cyclohexyl-5-(1-phenyl-1,2,3,4-tetrazol-5-yl)valeramide

N,N-Dicyclohexyl-5-(1-phenyl-1,2,3,4-tetrazol-5-yl)valeramide

N,N-Dicyclohexyl-4-(1-cyclohexyl-1,2,3,4-tetrazol-5-yl)butyramide

N-Ethyl-N-cyclohexyl-4-[1-(4-hydroxycyclohexyl)-1,2,3,4-tetrazol-5-yl]butyramide

N-Methyl-N-cyclohexyl-5-[1-(4-acetyloxycyclohexyl)-1,2,3,4-tetrazol-5-yl]valeramide

N-Methyl-N-cyclohexyl-5-[1-(4-methylcyclohexyl)-1,2,3,4-tetrazol-5-yl]valeramide

N-Methyl-N-cyclohexyl-5-[1-(3,4-dimethoxycyclohexyl)-1,2,3,4-tetrazol-5-yl]valeramide

N-Methyl-N-cyclohexyl-4-[1-(2-chlorocyclohexyl)-1,2,3,4-tetrazol-5-yl]butyramide

N-Methyl-N-cyclohexyl-5-[1-(4-(N,N-dimethylamino)cyclohexyl)-1,2,3,4-tetrazol-5-yl]valeramide

N-Ethyl-N-(4-hydroxycyclohexyl)-4-(1-cyclohexyl-1,2,3,4-tetrazol-5-yl)butyramide

N-Methyl-N-(2-hydroxycyclohexyl)-4-(1-phenyl-1,2,3,4-tetrazol-5-yl)butyramide

N-(4-Hydroxycyclohexyl)-5-(1-phenyl-1,2,3,4-tetrazol-5-yl)valeramide

N-Methyl-N-(4-acetyloxycyclohexyl)-4-(1-ethyl-1,2,3,4-tetrazol-5-yl)butyramide

N-Ethyl-N-(2-acetyloxycyclohexyl)-5-(1-phenyl-1,2,3,4-tetrazol-5-yl)valeramide

N-Ethyl-N-(3-acetyloxycyclohexyl)-4-(1-cyclohexyl-1,2,3,4-tetrazol-5-yl)butyramide

N-Ethyl-N-(4-methylcyclohexyl)-4-(1-cyclohexyl-1,2,3,4-tetrazol-5-yl)butyramide

N-Methyl-N-(3,4-dimethylcyclohexyl)-5-(1-phenyl-1,2,3,4-tetrazol-5-yl)valeramide

N-Ethyl-N-(2-methoxycyclohexyl)-5-(1-cyclohexyl-1,2,3,4-tetrazol-5-yl)valeramide

N-Methyl-N-(3,4-dimethoxycyclohexyl)-5-(1-pheny-1,2,3,4-tetrazol-5-yl)valeramide

N,N-Di(4-hydroxycyclohexyl)-4-[1-(4-hydroxycyclohexyl)-1,2,3,4-tetrazol-5-yl]butyramide

N-Methyl-N-(2-chlorocyclohexyl)-5-(1-methyl-1,2,3,4-tetrazol-5-yl)valeramide

N-Methyl-N-[4-(N,N-dimethylamino)cyclohexyl]-4-(1-phenyl-1,2,3,4-tetrazol-5-yl)butyramide

N-Methyl-N-(4-nitrocyclohexyl)-4-(1-methyl-1,2,3,4-tetrazol-5-yl)butyramide

N-Methyl-N-(4-aminosulfonylcyclohexyl)-5-(1-cyclohexyl-1,2,3,4-tetrazol-5-yl)valeramide

N-Methyl-N-(4-hydroxyphenyl)-5-(1-phenyl-1,2,3,4-tetrazol-5-yl)valeramide

N-Ethyl-N-phenyl-4-(1-methyl-1,2,3,4-tetrazol-5-yl)butyramide

N-Methyl-N-phenyl-5-(1-phenyl-1,2,3,4-tetrazol-5-yl)valeramide

N,N-Diphenyl-5-(1-phenyl-1,2,3,4-tetrazol-5-yl)valeramide

N-Phenyl-4-(1-phenyl-1,2,3,4-tetrazol-5-yl)butyramide

N-Methyl-N-(4-methylphenyl)-5-(1-phenyl-1,2,3,4-tetrazol-5-yl)valeramide

N-Methyl-N-(2,5-dimethylphenyl)-4-(1-phenyl-1,2,3,4-tetrazol-5-yl)butyramide

N-Methyl-N-(3,4-dimethoxyphenyl)-4-(1-phenyl-1,2,3,4-tetrazol-5-yl)butyramide

N-Methyl-N-(4-methoxyphenyl)-4-[1-(4-methoxyphenyl)-1,2,3,4-tetrazol-5-yl]butyramide

N-Methyl-N-(3,4-dichlorophenyl)-4-(1-cyclohexyl-1,2,3,4-tetrazol-5-yl)butyramide

N-Methyl-N-cyclohexyl-4-[1-(2-methoxyphenyl)-1,2,3,4-tetrazol-5-yl]butyramide

N-Ethyl-N-cyclohexyl-4-[1-(4-chlorophenyl)-1,2,3,4-tetrazol-5-yl]butyramide

N-Methyl-N-phenyl-5-[1-(4-methylphenyl)-1,2,3,4-tetrazol-5-yl]valeramide

N-Methyl-N-cyclohexyl-4-[1-(4-(N,N-dimethylamino)phenyl)-1,2,3,4-tetrazol-5-yl]butyramide

N-Methyl-N-cyclohexyl-4-[1-(4-aminosulfonylphenyl)-1,2,3,4-tetrazol-5-yl]butyramide

N,N-Diethyl-5-(1-ethyl-1,2,3,4-tetrazol-5-yl)valeramide

N-Methyl-N-tert-butyl-4-(1-methyl-1,2,3,4-tetrazol-5-yl)butyramide

N,N-Diethyl-5-(1-cyclohexyl-1,2,3,4-tetrazol-5-yl)valeramide

N,N-Diethyl-5-(1-phenyl-1,2,3,4-tetrazol-5-yl)valeramide

N,N-Diethyl-4-[1-(4-hydroxycyclohexyl)-1,2,3,4-tetrazol-5-yl]butyramide

N,N-Diethyl-5-[1-(3,4-dimethloxyphenyl)-1,2,3,4-tetrazol-5-yl]valeramide

N-tert-Butyl-4-(1-phenyl-1,2,3,4-tetrazol-5-yl)butyramide

5-(1-Phenyl-1,2,3,4-tetrazol-5-yl)valeramide

N-Ethyl-N-cyclohexylmethyl-5-(1-methyl-1,2,3,4-tetrazol-5-yl)valeramide

N,N-Dicyclohexylmethyl-5-(1-cyclohexyl-1,2,3,4-tetrazol-5-yl)valeramide

N-Cyclohexyl-N-cyclohexylmethyl-4-(1-cyclohexyl-1,2,3,4-tetrazol-5-yl)butyramide

N-Cyclohexylmethyl-N-(2-cyclohexylethyl)-4-(1-cyclohexyl-1,2,3,4-tetrazol-5-yl)butyramide

N-Ethyl-N-benzyl-4-(1-phenyl-1,2,3,4-tetrazol-5-yl)butyramide

N-Cyclohexyl-N-benzyl-5-(1-cyclohexyl-1,2,3,4-tetrazol-5-yl)valeramide

N-Ethyl-N-[2-(3,4-dimethyloxyphenyl)ethyl]-4-(1-cyclohexyl-1,2,3,4-tetrazol-5-yl)butyramide

N-Benzyl-N-[2-(3,4-dimethoxyphenyl)ethyl]-4-(1-phenyl-1,2,3,4-tetrazol-5-yl)butyramide

N-Phenyl-N-[2-(3,4-dimethoxyphenyl)ethyl]-4-(1-phenyl-1,2,3,4-tetrazol-5-yl)butyramide

N-Ethyl-N-[2-(3,4-diacetyloxyphenyl)ethyl]-4-(1-cyclohexyl-1,2,3,4-tetrazol-5-yl)butyramide

N-Cyclohexyl-N-[2-(3,4-dichlorophenyl)ethyl]-4-(1-cyclohexyl-1,2,3,4-tetrazol-5-yl)butyramide

N-Ethyl-N-[1-(4-nitrophenyl)ethyl]-4-(1-methyl-1,2,3,4-tetrazol-5-yl)butyramide

N-Methyl-N-cyclohexyl-5-(1,2,3,4-tetrazol-5-yl)valeramide

N-Phenyl-N-cyclohexyl-4-(1,2,3,4-tetrazol-5-yl)butyramide

5-(1,2,3,4-Tetrazol-5-yl)valeramide

N-Cyclohexyl-N-(2-hydroxyethyl)-4-(1-cyclohexyl-1,2,3,4-tetrazol-5-yl)butyramide

N-Methyl-N-(2-hydroxyethyl)-5-(1-phenyl-1,2,3,4-tetrazol-5-yl)valeramide

5-(4-Piperidinocarbonylbutyl)-1-phenyl-1,2,3,4-tetrazole

5-(4-Piperidinocarbonylbutyl)-1-methyl-1,2,3,4-tetrazole

5-[3-(1-Imidazolyl)carbonylpropyl]-1-cyclohexyl-1,2,3,4-tetrazole

5-[4-(4-Methylpiperazino)carbonylbutyl]-1-phenyl-1,2,3,4-tetrazole

5-[3-(4-Acetylpiperazino)carbonylpropyl]-1-methyl-tetrazole

N-(2-Pyridyl)-5-(1-methyl-1,2,3,4-tetrazol-5-yl)valeramide

N-Ethyl-N-(2-pyridyl)-4-(1-phenyl-1,2,3,4-tetrazol-5-yl)butyramide

N-Methyl-N-(2-pyridylmethyl)-4-(1-cyclohexyl-1,2,3,4-tetrazol-5-yl)butyramide

N-Methyl-N-[2-(3-pyrrolinyl)methyl]-4-(1-cyclohexyl-1,2,3,4-tetrazol-5-yl)butyramide

N-Cyclohexyl-N-(4-piperidinylmethyl)-5-(1-cyclohexyl-1,2,3,4-tetrazol-5-yl)-valeramide

N-Methyl-N-(2-imidazolyl)-5-(1-cyclohexyl-1,2,3,4-tetrazol-5-yl)valeramide

N-Cyclohexyl-N-(3-pyrazolylmethyl)-4-(1-methyl-1,2,3,4-tetrazol-5-yl)butyramide

N-(2-Pyrimidinyl)-4-(1-cyclohexyl-1,2,3,4-tetrazol-5-yl)thio-butyramide

N-Cyclohexyl-N-(3-pyridazinylmethyl)-4-(1-cyclohexyl-1,2,3,4-tetrazol-5-yl)butyramide

N-Methyl-N-(2-oxazolylmethyl)-4-(1-phenyl-1,2,3,4-tetrazol-5-yl)butyramide

N-Cyclohexyl-N-(morpholinomethyl)-4-(1-cyclohexyl-1,2,3,4-tetrazol-5-yl)butyramide

N-(2-Thiazolyl)-4-(1-methyl-1,2,3,4-tetrazol-5-yl)butyramide

N-Methyl-N-(2-furyl)-5-(1-cyclohexyl-1,2,3,4-tetrazol-5-yl)valeramide

N-Methyl-N-(2-tetrahydrofurylmethyl)-4-(1-cyclohexyl-1,2,3,4-tetrazol-5-yl)butyramide

N-(2-Thienyl)-4-(1-phenyl-1,2,3,4-tetrazol-5-yl)butyramide

N-Ethyl-N-[1-(4-nitrophenyl)ethyl]-4-(1-methyl-1,2,3,4-tetrazol-5-yl)thio-butyramide

N-Methyl-N-[2-(4-aminosulfonylphenyl)ethyl]-4-(1methyl-1,2,3,4-tetrazol-5-yl)thio-butyramide

N-Ethyl-N-cyclohexyl-4-[1-(2-nitrocyclohexyl)-1,2,3,4-tetrazol-5-yl]butyramide

N-Methyl-N-cyclohexyl-4-[1-(4-aminosulfonylcyclohexyl)-1,2,3,4-tetrazol-5-yl]butyramide

N-Phenyl-N-[2-(3,4-dimethylphenyl)ethyl]-4-(1-phenyl-1,2,3,4-tetrazol-5-yl)butyramide

N-Methyl-N-[2-(4-(N,N-dimethylamino)phenyl)ethyl]-4-(1-cyclohexyl-1,2,3,4-tetrazol-5-yl)butyramide

N-Methyl-N-[2-(4-aminosulfonylphenyl)ethyl]-4-(1-phenyl-1,2,3,4-tetrazol-5-yl)butyramide

N,N-Diethyl-3-(1-methyl-1,2,3,4-tetrazol-5-yl)methylthio-propionamide

N,N-Diethyl-3-(1-phenyl-1,2,3,4-tetrazol-5-yl)methylthio-propionamide

N,N-Diethyl-3-(1-cyclohexyl-1,2,3,4-tetrazol-5-yl)methylthio-propionamide

N,N-Diethyl-3-[2-(1-methyl-1,2,3,4-tetrazol-5-yl)ethylthio]propionamide

N-Ethyl-N-cyclohexyl-3-(1-methyl-1,2,3,4-tetrazol-5-yl)methylthio-propionamide

N-Ethyl-N-cyclohexyl-3-(1-phenyl-1,2,3,4-tetrazol-5-yl)methylthio-propionamide

N-Ethyl-N-cyclohexyl-3-(1-cyclohexyl-1,2,3,4-tetrazol-5-yl)methylthio-propionamide

N-Ethyl-N-cyclohexyl-3-[2-methyl-3-(1-methyl-1,2,3,4-tetrazol-5-yl)propylthio]propionamide

N,N-dicyclohexyl-3-(1-cyclohexyl-1,2,3,4-tetrazol-5-yl)methylthio-propionamide

N-Ethyl-N-phenyl-3-(1-methyl-1,2,3,4-tetrazol-5-yl)methylthio-propionamide

N-Ethyl-N-phenyl-3-(1-cyclohexyl-1,2,3,4-tetrazol-yl)methylthio-propionamide

N-Ethyl-N-phenyl-3-(1-phenyl-1,2,3,4-tetrazol-5-yl)methylthio-propionamide

N,N-Diphenyl-3-(1-phenyl-1,2,3,4-tetrazol-5-yl)methylthio-propionamide

N-Ethyl-N-cyclohexyl-4-(1-methyl-1,2,3,4-tetrazol-5-yl)methylthio-butyramide

N-Ethyl-N-benzyl-3-(1-methyl-1,2,3,4-tetrazol-5-yl)methylthio-propionamide

N-Ethyl-N-cyclohexylmethyl-3-(1-methyl-1,2,3,4-tetrazol-5-yl)methylthio-propionamide

N-Ethyl-N-(4-hydroxycyclohexyl)-3-(1-methyl-1,2,3,4-tetrazol-5-yl)methylthio-propionamide

N-Ethyl-N-[2-(3,4-dimethoxyphenyl)ethyl]-3-(1-methyl-1,2,3,4-tetrazol-5-yl)methylthio-propionamide

N-Ethyl-N-(4-methylphenyl)-3-(1-methyl-1,2,3,4-tetrazol-5-yl)methylthio-propionamide

N-Ethyl-N-cyclohexyl-3-(1-ethyl-1,2,3,4-tetrazol-5-yl)methylthio-propionamide

N,N-Diethyl-3-[1-(4-ethylphenyl)-1,2,3,4-tetrazol-5-yl]methylthio-propionamide

N-Ethyl-N-cyclohexyl-3-[1-(4-hydroxycyclohexyl)-1,2,3,4-tetrazol-5-yl]methylthio-propionamide

N-Ethyl-N-cyclohexyl-3-[1-(3,4-dimethoxyphenyl)-1,2,3,4-tetrazol-5-yl]methylthio-propionamide

N-Ethyl-N-cyclohexyl-3-(1,2,3,4-tetrazol-5-yl)methylthio-propionamide

3-(1-Methyl-1,2,3,4-tetrazol-5-yl)methylthio-propionamide

N-Ethyl-N-(2-hydroxyethyl)-3-(1-methyl-1,2,3,4-tetrazol-5-yl)methylthio-propionamide

N-Ethyl-N-(2-pyridyl)-3-(1-methyl-1,2,3,4-tetrazol-5-yl)methylthio-propionamide

N-Ethyl-N-(2-pyridylmethyl)-3-(1-methyl-1,2,3,4-tetrazol-5-yl)methylthio-propionamide

N-Ethyl-3-(1-methyl-1,2,3,4-tetrazol-5-yl)methylthio-propionamide

N-Cyclohexyl-3-(1-methyl-1,2,3,4-tetrazol-5-yl)methylthio-propionamide

N-Phenyl-3-(1-methyl-1,2,3,4-tetrazol-5-yl)methylthio-propionamide

N-Furyl-3-(1-methyl-1,2,3,4-tetrazol-5-yl)methylthio-propionamide

N-Ethyl-N-(2-thienylmethyl)-3-(1-methyl-1,2,3,4-tetrazol-5-yl)methylthio-propionamide

5-[(2-Piperidinocarbonylethyl)thiomethyl]-1-methyl-1,2,3,4-tetrazole

5-[(2-Morpholinocarbonylethyl)thiomethyl]-1-methyl-1,2,3,4-tetrazole

Methyl 4-(1-methyl-1,2,3,4-tetrazol-5-yl)thio-butyrate

Methyl 4-(1-isopropyl-1,2,3,4-tetrazol-5-yl)thio-butyrate

Methyl 4-(1-phenyl-1,2,3,4-tetrazol-5-yl)thio-butyrate

Ethyl 4-(1-cyclohexyl-1,2,3,4-tetrazol-5-yl)thio-butyrate

Ethyl 4-(1-methyl-1,2,3,4-tetrazol-5-yl)thio-butyrate

Isopropyl 3-(1-ethyl-1,2,3,4-tetrazol-5-yl)thio-propionate

Ethyl 4-(1-cycloocytyl-1,2,3,4-tetrazol-5-yl)thio-butyrate

Methyl 5-(1-phenyl-1,2,3,4-tetrazol-5-yl)valerate

Methyl 5-(1-cyclohexy-1,2,3,4-tetrazol-5-yl)valerate

Methyl 5-(1-methyl-1,2,3,4-tetrazol-5-yl)valerate

4-(1-Methyl-1,2,3,4-tetrazol-5-yl)thio-butyric acid

4-(1-Phenyl-1,2,3,4-tetrazol-5-yl)thio-butyric acid

4-(1-Cyclohexyl-1,2,3,4-tetrazol-5-yl)thio-butyric acid

5-(1-Methyl-1,2,3,4-tetrazol-5-yl)valeric acid

5-(1-Phenyl-1,2,3,4-tetrazol-5-yl)valeric acid

5-(1-Cyclohexyl-1,2,3,4-tetrazol-5-yl)valeric acid

Methyl 3-(1-methyl-1,2,3,4-tetrazol-5-yl)methylthio-propionate

Ethyl 3-(1-phenyl-1,2,3,4-tetrazol-5-yl)methylthio-propionate

Methyl 3-(1-cyclohexyl-1,2,3,4-tetrazol-5-yl)methylthio-propionate

Methyl 3-[2-(1-methyl-1,2,3,4-tetrazol-5-yl)ethylthio]propionate

Methyl 4-(1-methyl-1,2,3,4-tetrazol-5-yl)methylthio-butyrate

Methyl 3-[2-methyl-3-(1-methyl-1,2,3,4-tetrazol-5yl)propylthio]propionate

3-(1-Methyl-1,2,3,4-tetrazol-5-yl)methylthio-propionic acid

3-(1-Phenyl-1,2,3,4-tetrazol-5-yl)methylthio-propionic acid

3-(1-Cyclohexyl-1,2,3,4-tetrazol-5-yl)methylthio-propionic acid

3-[2-(1-Methyl-1,2,3,4-tetrazol-5-yl)ethylthio]propionic acid

4-(1-Methyl-1,2,3,4-tetrazol-5-yl)methyltio-butyric acid

Methyl 3-[1-(4-ethylphenyl)-1,2,3,4-tetrazol-5-yl]methylthio-propionate

Methyl 3-[1-(3,4-dimethoxyphenyl)-1,2,3,4-tetrazol-5-yl]methylthio-propionate

Methyl 3-[1-(4-chlorophenyl)-1,2,3,4-tetrazol-5-yl)methylthio-propionate

Methyl 3-[1-(3,4-dihydroxyphenyl-1,2,3,4-tetrazol-5-yl]methylthio-propionate

Methyl 3-[1-(2-methylcyclohexyl)-1,2,3,4-tetrazol-5-yl)methylthio-propionate

Methyl 3-[1-(4-hydroxycyclohexyl)-1,2,3,4-tetrazol-5-yl]methylthio-propionate

Methyl 3[1-(4-methyoxycyclohexyl)-1,2,3,4-tetrazol-5-yl]methylthio-propionate

Methyl 3-[1-(4-chlorocyclohexyl)-1,2,3,4-tetrazol-5-yl]methylthio-propionate

3-[1-(4-Ethylphenyl)-1,2,3,4-tetrazol-5-yl]methylthio-propionic acid

3-[1-(2-Methoxyphenyl)-1,2,3,4-tetrazol-5-yl]methylthio-propionic acid

3-[1-(4-Hydroxyphenyl)-1,2,3,4-tetrazol-5-yl]methylthio-propionic acid

3-[1-(4-Methylcyclohexyl)-1,2,3,4-tetrazol-5-yl]methylthio-propionic acid

3-[1-(2-Methoxycyclohexyl)-1,2,3,4-tetrazol-5-yl]methylthio-propionic acid

3-[1-(4-Hydroxycyclohexyl)-1,2,3,4-tetrazol-5-yl]methylthio-propionic acid

3-[1-(2-Chlorocyclohexyl)-1,2,3,4-tetrazol-5-yl]methylthio-propionic acid

Methyl 4-[1-(4-methylphenyl)-1,2,3,4-tetrazol-5-yl]thio-butyrate

Methyl 4-[1-(3,4-dimethoxyphenyl)-1,2,3,4-tetrazol-5-yl]thio-butyrate

Methyl 4-[1-(2-hydroxyphenyl)-1,2,3,4-tetrazol-5-yl]thio-butyrate

Methyl 4-[1-(2-methylcyclohexyl)-1,2,3,4-tetrazol-5-yl]thio-butyrate

Methyl 4-[1-(4-hydroxycyclohexyl)-1,2,3,4-tetrazol-5-yl]thio-butyrate

Methyl 4-[1-(3,4-dimethoxycyclohexyl)-1,2,3,4-tetrazol-5-yl]thio-butyrate

4-[1-(2-Methylphenyl)-1,2,3,4-tetrazol-5-yl]thio-butyric acid

4-[1-(4-Methoxyphenyl)-1,2,3,4-tetrazol-5-yl]thio-butyric acid

4-[1-(3,4-Dimethoxyphenyl)-1,2,3,4-tetrazol-5-yl]thio-butyric acid

4-[1-(4-Methylcyclohexy)-1,2,3,4-tetrazol-5-yl]thio-butyric acid

4-[1-(2-Hydroxycyclohexyl)-1,2,3,4-tetrazol-5-yl]thio-butyric acid

4-[1-(3,4-Dimethoxycyclohexyl)-1,2,3,4-tetrazol-5-yl]thio-butyric acid

5-[1-(2-Methoxyphenyl)-1,2,3,4-tetrazol-5-yl]valeric acid

5-[1-(4-Hydroxycyclohexyl)-1,2,3,4-tetrazol-5-yl]valeric acid

5-[1-(4-Methylphenyl)-1,2,3,4-tetrazol-5-yl]valeric acid

5-[1-(2-Chlorocyclohexyl)-1,2,3,4-tetrazol-5-yl]valeric acid

4-[1-(4-(N,N-Dimethylamino)phenyl)-1,2,3,4-tetrazol-5-yl]thio-butyric acid

4-[1-(4-Nitrophenyl)-1,2,3,4-tetrazol-5-yl]thio-butyric acid

4-[1-(4-Aminosulfonylphenyl)-1,2,3,4-tetrazol-5-yl]thio-butyric acid

4-[1-(2-Acetyloxyphenyl)-1,2,3,4-tetrazol-5-yl]thio-butyric acid

5-(1,2,3,4-Tetrazol-5-yl)valeric acid

Methyl 5-(1,2,3,4-tetrazol-5-yl)valerate

Methyl 4-(1,2,3,4-tetrazol-5-yl)thio-butyrate

4-(1,2,3,4-Tetrazol-5-yl)thio-butyric acid

3-(1,2,3,4-Tetrazol-5-yl)methylthio-propionic acid

Methyl 3-(1,2,3,4-tetrazol-5-yl)methylthio-propionate

The compounds of the present invention can be prepared by various processes. For instance, compounds [Ia] which are the compounds [I] wherein R² is the group: ##STR7## can be prepared by a process as shown in the following Reaction Scheme-I:

Reaction Scheme-I ##STR8## wherein R¹, R³, R⁴, A, B and l are as defined above.

The process as shown in Reaction Scheme-I is carried out by subjecting a carboxylic acid [II] and an amine [III] to an amido bond-forming reaction.

In the above process, a compound having an activated carboxyl group may be used instead of the carboxylic acid [II] and further a compound having an activated amino group instead of the amine [III]. The amido bond-forming reaction includes any conventional processes, such as (i) a mixed acid anhydride method, i.e. a process comprising reacting the carboxylic acid [II] with an alkyl halocarboxylate to give a mixed acid anhydride and reacting the mixed acid anhydride with the amine [III]; (ii) an active ester method, i.e. a process comprising converting the carboxylic acid [II] into an active ester, for example, p-nitrophenyl ester, N-hydroxysuccinimide ester, or N-hydroxybenzotriazole ester, and then reacting the active ester with the amine [III]; (iii) a carbodiimide method, i.e. a process comprising condensing the carboxylic acid [III] with the amine [III] in the presence of a dehydrating agent such as dicyclohexylcarbodiimide or carbonyldiimidazole; (iv) a carboxylic acid halide method, i.e. a process comprising reacting a halide compound of the carboxylic acid [II] with the amine [III]; (v) a process comprising converting the carboxylic acid [II] into an acid anhydride compound thereof by using a dehydrating agent such as acetic anhydride and then reacting the resulting acid anhydride with the amine [III]; and (vi) a process comprising converting the carboxylic acid [II] into an ester with a lower alcohol and reacting the resulting ester with the amine [III] under a high pressure and at a high temperature. Among these process, the mixed acid anhydride method and carboxylic acid halide method are preferable. The alkyl halocarboxylate used in the mixed acid anhydride method includes, for instance, methyl chloroformate, methyl bromoformate, ethyl chloroformate, ethyl bromoformate, isobutyl chloroformate, and the like. The mixed acid anhydride may be prepared by the well-known Schotten-Baumann reaction and can be used to the subsequent reaction with the amine [III] without isolation from the reaction mixture. The Schotten-Baumann reaction can be done in the presence of a basic compound. The basic compound includes all compounds which are usually used in Schotten-Baumann reaction, for example, organic bases such as triethylamine, trimethylamine, pyridine, dimethylaniline, N-methylmorpholine, 1,5-diazabicyclo[4.3.0]nonene-5 (DBN), 1,5-diazabicyclo[5.4.0]undecene-5 (DBU), 1,4-diazabicyclo[2.2.2]octane (DABCO), or the like, and inorganic bases such as potassium carbonate, sodium carbonate, potassium hydrogen carbonate, sodium hydrogen carbonate, or the like. The reaction is usually carried out at a temperature of -20° to 100° C., preferably 10° to 50° C., for about 5 minutes to about 10 hours.

The mixed acid anhydride method is usually carried out in an appropriate solvent. The solvent includes all solvent conventional in this method, for example, halogenated hydrocarbons such as methylene chloride, chloroform or dichloroethane, aromatic hydrocarbons such as benzene, toluene or xylene, ethers such as diethyl ether, tetrahydrofuran or dimethoxyethane, esters such as methyl acetate or ethyl acetate, aprotic polar solvents such as dimethylformamide, dimethylsulfoxide or hexamethylphosphoric triamide, and the like. The carboxylic acid [II], the alkyl halocarboxylate and the amine [III] are usually used in such an amount that the alkyl halocarboxylate and the amine [III] are each at least equimolar to the carboxylic acid [II], preferably 1 to 1.5 mole to 1 mole of the carboxylic acid [II].

The carboxylic acid halide method is carried out by reacting the carboxylic acid [II] with a halogenating agent to obtain a halide compound of the carboxylic acid [II] and then reacting the resulting carboxylic acid halide with the amine [II] after isolating and purifying the halide from the reaction mixture or without isolation.

The reaction of the carboxylic acid [II] and the halogenating agent is carried out in the presence or absence of a solvent. The solvent includes all solvents which do not give undesirable effect to the reaction, for example, aromatic hydrocarbons such as benzene, toluene or xylene, halogenated hydrocarbons such as chloroform, methylene chloride or carbon tetrachloride, ethers such as dioxane, tetrahydrofuran or diethyl ether, aprotic polar solvents such as dimethylformamide or dimethylsulfoxide, and the like. The halogenating agent includes any conventional halogenating agent which can convert the hydroxy group of the carboxyl group into halogen, for example, thionyl chloride, phosphorus oxychloride, phosphorus oxybromide, phosphorus pentachloride, phosphorus pentabromide, or the like.

The ratio of amount of the carboxylic acid [II] and the halogenating agent is not critical, but when the reaction is carried out in the absence of a solvent, the latter i.e. the acid [II], is used in a largely excess amount, and when the reaction is carried out in the presence of a solvent, the latter is used in an amount equivalent or more to the former, preferably 2 to 4 moles to 1 mole of the former. The reaction temperature and reaction time are not critical either, but the reaction is usually carried out at a temperature of room temperature to 100° C., preferably 50° to 80° C., for 30 minutes to 6 hours.

The reaction of the carboxylic acid halide with the amine [III] is usually carried out in the presence of a dehydrohalogenating agent. The dehydrohalogenating agent is usually basic compounds. The basic compounds used as the dehydrohalogenating agent include all conventional compounds, for example, inorganic bases such as sodium hydroxide, potassium hydroxide, sodium carbonate, potassium carbonate, sodium hydrogen carbonate, potassium hydrogen carbonate or silver carbonate, alkali metals such as sodium or potassium, alcoholates such as sodium methylate or sodium ethylate, organic bases such as triethylamine, pyridine, N,N-dimethylaminopyridine, 1,5-diazabicyclo[4.3.0]nonene-5 (DBN), 1,5-azabicyclo[5.4.0]undecene-5 (DBU) or 1,4-diazabicyclo[2.2.2]octane (DABCO)], or the like. The amine [III] may be used in a largely excess amount instead of using the dehydrohalogenating agent. The reaction may be carried out in the presence or absence of a solvent. The solvent includes any inert solvent which does not give undesirable effect to the reaction, for example, halogenated hydrocarbons such as chloroform, methylene chloride or carbon tetrachloride, ethers such as diethyl ether, tetrahydrofuran or dioxane, aromatic hydrocarbons such as benzene, toluene or xylene, esters such as methyl acetate or ethyl acetate, aprotic polar solvents such as N,N-dimethylformamide, dimethylsulfoxide or hexamethylphosphoric triamide, and the like.

The ratio of amount of the carboxylic acid halide and the amine [III] is not critical, but when the reaction is carried out in the absence of a solvent, the latter, i.e. the amine [III], is usually used in a largely excess amount, and when the reaction is carried out in the presence of a solvent, the latter is usually used in an amount of equivalent or more to the former, preferably 1 to 2 moles to 1 mole of the former. The reaction temperature and reaction time are not critical either, but the reaction is usually carried out at a temperature of -30° to 100° C., preferably 0° to 50° C., for 30 minutes to 12 hours.

The compounds [Ib] which are the compounds [I] wherein l is 1 can be prepared by a process as shown in the following Reaction Scheme-II:

Reaction Scheme-II ##STR9## wherein l' is 1, X is a halogen, and R¹, R² and A are as defined above.

The dehydrohalogenation reaction of a 5-mercaptotetrazole derivative [IV] and a haloalkanecarboxylic acid derivative [V] in the above Reaction Scheme-II is usually carried out in the presence of the same dehydrohalogenating agent as used in the above Reaction Scheme-I. The reaction may be carried out in the presence or absence of a solvent. The solvent includes all inert solvents which do not give undesirable effect to the reaction, for example, alcohols such as methanol, ethanol, propanol, butanol or ethylene glycol, ethers such as diethyl ether, tetrahydrofuran, dioxane, monoglyme or diglyme, ketones such as acetone or methyl ethyl ketone, aromatic hydrocarbons such as benzene, toluene or xylene, esters such as methyl acetate or ethyl acetate, aprotic polar solvents such as N,N-dimethylformamide, dimethylsulfoxide or hexamethylphosphoric triamide, and the like. Besides, it is preferable to do the reaction in the presence of a metal iodide such as sodium iodide or potassium iodide.

The ratio of amount of the compound [IV] and the compound [V] is not critical, but when the reaction is carried out in the absence of a solvent, the latter, i.e. the compound [V], is used in a largely excess amount, and when the reaction is carried out in the presence of a solvent, the latter is used in an amount of 1 to 5 moles, preferably 1 to 2 moles, to 1 of the former. The reaction temperature and reaction time are not critical either, but the reaction is usally carried out at a temperature of -30° to 200° C., preferably 0° to 160° C., for about 1 to 30 hours.

Compounds [Ic] which are the compounds [I] wherein l is 0 and R² is a lower alkoxy can be prepared by a process as shown in the following Reaction Scheme-III:

Reaction Scheme-III ##STR10## wherein R¹ and B are as defined above, and R⁵ is a lower alkyl.

The reaction of a carboxylic acid [VI] and an amine [VII] in the above Reaction Scheme-III may preferably be carried out under the same conditions as shown in the mixed acid anhydride method and carboxylic acid halide method as mentioned in the above Reaction Scheme-I.

The reaction of a haloamide [VIII] with phosphorus pentachloride: PCl₅ is usually carried out in a solvent. The solvent includes all inert solvents which do not give undesirable effect to the reaction, for example, aromatic hydrocarbons such as benzene, toluene or xylene, halogenated aromatic hydrocarbons such as chlorobenzene or bromobenzene, ethers such as diethyl ether or dioxane, aliphatic hydrocarbons such as n-hexane or n-heptane, and the like. The ratio of amount of the haloamide [VIII] and PCl₅ is not critical, but usually, the latter, i.e. PCl₅, is used in an amount of 1 to 2 moles, preferably 1 to 1.2 mole, to 1 mole of the former. The reaction temperature and reaction time are not critical either, but the reaction is usually carried out at a temperature of -20° to 50° C., preferably 0° to 25° C., for 30 minutes to 5 hours.

The above reaction of the haloamide [VIII] with PCl₅, there is formed a haloimine derivative, and this compound is subsequently reacted with hydrogen azide: HN₃ without isolation from the reaction mixture. The reaction is usually carried out in an appropriate solvent such as benzene, xylene, diethyl ether, n-hexane, or the like. The hydrogen azide is usually used in an amount of 1 to 5 moles, preferably 1 to 3 moles, to 1 mole of the haloimine derivative. The reaction is usually carried out at a temperature of 0° to 150° C. for 3 hours to 2 days.

Compounds [Id] which are the compounds [I] wherein A is a lower alkylenethio can be prepared by a process as shown in the following Reaction Scheme-IV:

Reaction Scheme-IV ##STR11## wherein X, R¹, R², and B are as defined above, and D is a lower alkylene.

In Reaction Scheme-IV, the reaction of a compound [IX] and a compound [VII] and the reaction of a compound [X] and PCl₅ followed by the reaction with HN₃ are carried out under the same reaction conditions as in the reaction of the compound [VI] and the compound [VII] and the reaction of the compound [VIII] and PCl₅ followed by the reaction with HN₃ in the above Reaction Scheme-III, respectively. Besides, the reaction of a compound [XI] and a compound [XII] is carried out under the same reaction conditions as in the reaction of the compound [IV] and the compound [V] in the above Reaction Scheme-II.

Moreover, Compounds [Ie] which are the compounds [I] wherein R² is a lower alkoxy can be converted into compounds [If] which are the compounds [I] wherein R² is hydroxy by hydrolysis thereof, as shown in the following Reaction Scheme-V:

Reaction Scheme-V ##STR12## wherein A, l, B, R¹, are as defined above.

Hydrolysis of the compound [Ie] can be carried out by conventional methods, for instance, in the presence of a basic compound such as sodium hydroxide, potassium hydroxide or barium hydroxide, or a mineral acid such as sulfuric acid, hydrochloric acid or boric acid. This hydrolysis is preferably carried out in an appropriate solvent. The solvent includes all conventional solvents which do not give undesirable effect to the reaction, and suitable examples are water and lower alcohols such as methanol, ethanol, isopropanol, or the like. The reaction temperature and reaction time are not critical, but the hydrolysis is usually carried out at a temperature of room temperature to 150° C. preferably 50° to 110° C., for about 30 minutes to 10 hours.

The starting compounds used in the above Reaction Schemes-I to V are partially known and are partially novel. For instance, the compounds [II] used in Reaction Scheme-I are novel and can be prepared by the processes as shown in Reaction Schemes-II, III, IV and V. Another starting compounds [III] are partially known and include novel compounds, which are prepared by the processes as shown in the following Reaction Schemes-VI and VII:

Reaction Scheme-VI ##STR13##

Reaction Scheme-VII ##STR14## wherein RL³ and R⁴ are as defined above, and X is a halogen.

In the above Reaction Schemes-VI and VII, the reaction of an amine [XIII] and a halogen compound [XIV] and the reaction of an amine [XV] and a halogen compound [XVI] are carried out under the same reaction conditions as used in the dehydrohalogenation reaction in Reaction Scheme-II.

The compounds [IV] used in Reaction Scheme-II are known and another starting compounds [V] are partially known and are partially novel. For example, compounds [Va] which are the compounds [V] wherein R² is ##STR15## are prepared by a process as shown in the following Reaction Scheme-VIII:

Reaction Scheme-VIII ##STR16## wherein X, B, R³ and R⁴ are as defined above.

The reaction of a known halocarboxylic acid [XVII] and an amine [III] can be carried out under the same reaction conditions as used in the amido bond-forming reaction in Reaction Scheme-I.

The starting compounds used in Reaction Schemes-III and VI are known. The starting compounds used in Reaction Scheme-V can be prepared by the same process as used in Reaction Schemes-II to IV.

The compounds [I] having an acidic group may be converted into a salt thereof with a pharmaceutically acceptable basic compound. The basic compound includes metal hydroxides such as sodium hydroxide or potassium hydroxide, alkali metal alcoholates such as sodium methylate or potassium ethylate, and the like. The compounds [I] having a basic group may also be converted into a salt with a pharmaceutically acceptable acid. The pharmaceutically acceptable acid includes inorganic acids such as sulfuric acid, nitric acid, hydrochloric acid or hydrobromic acid, and organic acids such as acetic acid, p-toluenesulfonic acid, ethanesulfonic acid, oxalic acid, maleic acid, succinic acid or benzoic acid.

The compounds obtained in the above processes can easily be isolated from the reaction mixture and purified by conventional methods. For instance, the isolation can be carried out by precipitation, extraction, recrystallization, distillation, column chromatography, preparative thin layer chromatography, and the like.

The compounds [I] or their pharmaceutically acceptable salts of the present invention are useful for the treatment of peptic and duodenal ulcers and are usually used in the form of conventional pharmaceutical preparations. The pharmaceutical preparations can be prepared by using conventional diluents and carriers, such as fillers, bulking agents, binding agents, wetting agents, disintegrators, surface active agents, lubricants, or the like. The preparations may be in various forms, such as tablets, pills, powders, solutions, suspentions, emulsions, granules, capsules, suppositories, injections (solution, suspension, etc.) and the like. The tablets can be prepared by using conventional carriers, such as excipients (e.g. lactose, sucrose, sodium chloride, glucose, urea, starches, calcium carbonate, kaolin, crystalline cellulose, silicic acid, etc.), binding agents (e.g. water, ethanol, propanol, simple syrup, aqueous glucose solution, aqueous solution of starches, aqueous gelatine solution, carboxymethyl cellulose, shellac, methyl cellulose, potassium phosphate, polyvinyl pyrrolidone, etc.), disintegrators (e.g. dry starches, sodium arginate, agar powder, laminaran powder, sodium hydrogen carbonate, calcium carbonate, polyoxyethylene sorbitan fatty acid esters, sodium laurylsulfate, monoglyceryl stearate, starches, lactose, etc.) disintegration inhibitors (e.g. sucrose, stearin, cacao butter, hydrogenated oils, etc.), absoption accelerators (e.g. quaternary ammonium salt, sodium laurylsulfate, etc.), humectants (e.g. glycerin, starches, etc.), adsorbents (e.g. starches, lactose, kaolin, bentonite, colloidal silica, etc.), lubricants (e.g. purified talc, stearic acid salts, boric acid powder, polyethylene glycol, etc.), and the like. The tablets may be in the forms of sugar coating tablets, genlatin coating tablets, enteric coating tablets, film coating tablets, double or multiple layers tablets, and the like. The pills can be prepared by using conventional carriers, such as excipients (e.g. glucose, lactose, starches, cacao butter, hardened vegetable oils, kaolin, talc, etc.), binding agents (e.g. gum arabic powder, tragacanth powder, gelatin, ethanol, etc.), disintegrators (e.g. laminaran, agar, etc.), and the like. The suppositories can be prepared by using conventional carriers, such as polyethylene glycol, cacao butter, higher alcohols or their esters, gelatin, semi-synthetic glycerides, or the like. When the active compounds are prepared in the form of an injection, a solution or suspension containing the active compounds is sterilized and made isotonic to blood. The injections in the form of a solution, emulsion or suspension can be prepared by using conventional diluents, such as water, ethyl alcohol, propylene glycol, ethoxylated isostearyl alcohol, polyoxy-isostearyl alcohol, polyoxyethylene sorbitan fatty esters, or the like. The injection preparation may be made isotonic by adding thereto a sufficient amount of sodium chloride, glucose, glycerin, or the like and may optionally be incorporated with conventional solubilizers, buffer solutions, pain killers, colorants, preservatives, perfumes, flavors, sweetening agents, and other medicaments.

The anti-ulcer preparations of the present invention may contain a wide range of amount of the active compounds and contains usually about 1 to 70% by weight, preferably 5 to 50% by weight, of the active compounds of the present invention based on the total weight of the preparations.

The administration route of the anti-ulcer preparations of the present invention is not restricted, and suitable administration route is determined by the forms of the preparations, age, sex and other conditions of patients to be treated, severity of disease, and the like. Tablets, pills, solutions, suspensions, emulsions, granules and capsules are usually administered in oral route. Injections are usually administered in intravenous route alone or optionally together with an appropriate adjuvant such as glucose or amino acids or may be administerd along in intramuscular, intracutaneous, subcutaneous, or intraperitoneal route.

The dose of the active compounds of the present invention may vary with the usage, age, sex and other conditions of patients to be treated, severity of diseases, or the like, but is usually in the range of 0.6 to 50 mg/kg of body weight per day. The active compounds of the present invention is preferably contained in the anti-ulcer preparations in a dosage unit of 10 to 1000 mg.

The compounds of the present invention and preparation thereof are illustrated by the following Reference Examples and Examples, but are not limited thereto.

REFERENCE EXAMPLE 1

To ethyl acetate (400 ml) is added N-methylcyclohexylamine (26 ml), and to the mixture are added dropwise with stirring 4-chlorobutyryl chloride (25 ml) and triethylamine (33.5 ml) over a period of 20 minutes with keeping the inner temperature at 10° to 20° C. by ice-cooling. The mixture is further stirred at room temperature for one hour. After the reaction, water is added to the reaction mixture. The organic layer is separated and washed with water an aqueious saturated potassium carbonate solution, 10% aqueous hydrochloric acid and water in order, and then dried over anhydrous sodium sulfate. After filtering off sodium sulfate, the mother liquor is concentrated and distilled under reduced pressure to give N-methyl-N-cyclohexyl-4-chlorobutyramide (41.5 g), b.p. 133°-136° C./2 mmHg.

REFERENCE EXAMPLE 2

N-Ethyl-cyclohexylamine (2.6 g) is dissolved in dry benzene (20 ml). To the solution are added dropwise with stirring chloroacetyl chloride (2.6 g) and triethylamine (2.4 g) under ice-cooling. The mixture is stirred under ice-cooling for one hour and further at room temperature for one hour. The reaction mixture is poured onto ice-water and extracted with ether. The ether layer is washed with an aqueous sodium hydrogen carbonate solution and an aqueous saturated sodium chloride solution and dried over anhydrous magnesium sulfate. After distilling off the solvent, the resulting residue is distilled under reduced pressure to give N-ethyl-N-cyclohexyl-chloroacetamide (3 g), b.p. 118°-120° C./0.2 mmHg.

REFERENCE EXAMPLES 3 AND 4

In the same manner as described in Reference Example 2, the following compounds are prepared.

N-Ethyl-N-cyclohexyl-4-chlorobutyramide, b.p. 120°-130° C./1.5 mmHg

N-Ethyl-N-cyclohexyl-3-chloropropionamide, b.p. 103°-110° C./0.15 mmHg

REFERENCE EXAMPLE 5

To monomethyl adipate (6 g) is added thionyl chloride (10 ml), and the mixture is refluxed for one hour. Excess thionyl chloride is distilled off, and benzene is added to the residue and thionyl chloride is further removed by azeotropic distillation.

Separarely, aniline (4.2 g) and potassium carbonate (5.2 g) are dissolved in acetone (100 ml) and water (15 ml). To the mixture is added dropwise with stirring the chloride compound obtained above under ice-cooling. The mixture is stirred under ince-cooling for one hour and further at room temperature for 2 hours. After distilling off acetone, water is added to the residue, and the mixture is extracted with chloroform. The chloroform layer is washed with an aqueous saturated sodium chloride solution and dried over magnesium sulfate. Chloroform is distilled off to give methyl phenyladipinamate (9 g).

NMR: δ_(ppm) ^(CDCl).sbsp.3 1.40-1.90 (4H, m), 2.10-2.50 (4H, m), 3.66 (3H, s), 6.80-7.70 (5H, m), 8.55 (1H, br.s).

REFERENCE EXAMPLES 6 AND 7

In the same manner as described in Reference Example 5, the following compounds are obtained.

Methyl N-cyclohexyladipinamate, faint brown prisms (recrystallized from methanol-water), m.p. 72°-74° C.

Methyl N-methyladipinamate, colorless liquid, b.p. 136°-140° C./0.7 mmHg

REFERENCE EXAMPLE 8

A 40% aqueous methylamine solution (46.5 ml) is dissolved in acetone (300 ml). To the solution are added potassium carbonate (45.6 g) and water (100 ml), and thereto is added dropwise with stirring chloroacetyl chloride (24.3 ml) under ice-cooling. The mixture is stirred under ice-cooling for one hour and further at room temperature for 2 hours. After distilling off acetone, water is added to the residue, and the mixture is extracted with chloroform. The chloroform layer is washed with an aqueous saturated sodium chloride solution and dried over magnesium sulfate. After distilling off chloroform, the residue is distilled under reduced pressure to give N-methyl-chloroacetamide (15.5 g), colorless liquid, b.p. 107°-109° C,/27 mmHg.

REFERENCE EXAMPLE 9

N-Methyl-chloroacetamide (10.8 g) is dissolved in benzene (100 ml), and thereto is added with stirring phosphorus pentachloride (10.8 g) at below 15° C. The mixture is stirred at room temperature for one hour and then allowed to stand overnight. The mixture is slowly refluxed for 2 hours. The reaction mixture is concentrated, and thereto is added ice-water, and the mixture is extracted with chloroform. The chloroform layer is washed with water, a dilute aqueous sodium hydroxide solution and water, dried over magnesium sulfate and distilled to remove chloroform. The resulting residue is subjected to column chromatography (Wakogel C-200, made by Wako Pure Chemical Industry, eluting agent, chloroform: methanol=50:1, V/V) to isolate 1-methyl-5-chloromethyl-1,2,3,4-tetrazole (8.5 g).

EXAMPLE 1

4-(1-Methyl-1,2,3,4-tetrazol-5-yl)thio-butyric acid (2 g) is dissolved in dry tetrahydrofuran (30 ml), and thereto is added triethylamine (1.1 g). To the mixture is added dropwise with stirring isobutyl chloroformate (1.5 g) under ice-cooling. The mixture is stirred at room temperature for 30 minutes. To the mixture is further added dropwise with stirring diethylamine (0.9 g) at room temperature, and the mixture is stirred for 2 hours. The mixture is concentrated under reduced pressure, and the resulting residue is purified by subjecting it to column chromatography (Kieselgel 60, made by Merck & Co.). By eluting with n-hexaneethyl acetate (1:1), there is obtained N,N-diethyl-4-(1-methyl-1,2,3,4-tetrazol-5-yl)thio-butyramide (1.4 g), colorless liquid, n_(D) ¹⁷.5 =1.5227.

NMR: δ_(ppm) ^(CDCl).sbsp.3 1.04 (3H, t, J=7 Hz), 1.12 (3H, t, J=7 Hz), 1.90-2.70 (4H, m), 3.00-3.60 (6H, m), 3.88 (3H, s).

Elementary analysis for C₁₀ H₁₉ N₅ OS: Calcd. (%): C, 46.67; H, 7.44; N, 27.21. Found (%): C, 46.78; H, 7.51; N, 27.29.

EXAMPLES 2 TO 5

In the same manner as described in Example 1, the following compounds are obtained from appropriate starting materials.

(2) N-Ethyl-N-cyclohexyl-4-(1-methyl-1,2,3,4-tetrazol-5-yl)thio-butyramide, colorless liquid, n_(D) ¹⁷.5 =1.5327

NMR: δ_(ppm) ^(CDCl).sbsp.3 0.90-1.40 (3H, m), 1.20-2.00 (10H, m), 2.00-2.80 (4H, m), 3.00-3.60 (6H, m), 3.95 (3H, s), 3.50-4.50 (1H, m).

(3) N-Ethyl-N-phenyl-4-(1-methyl-1,2,3,4-tetrazol-5-yl)thio-butyramide, pale yellow liquid, n_(D) ²⁶ =1.5534.

NMR: δ_(ppm) ^(CDCl).sbsp.3 1.12 (3H, t, J=7 Hz), 170-2.40 (4H, m), 3.32 (2H, t, J=7 Hz), 3.74 (2H, q, J=14 Hz, 7 Hz), 3.90 (3H, s), 7.00-7.60 (5H, m).

(4) 5-(3-Morpholinocarbonylpropylthio)-1-methyl-1,2,3,4-tetrazole, white needles (recrystallized from petroleum ether-ethanol), m.p. 71°-73° C.

(5) 5-[3-(4-Acetylpiperadinocarbonyl)propylthio]-1-methyl-1,2,3,4-tetrazole, white crystalline powder (recrystallized from ligroine-acetone), m.p. 90°-91.5° C.

EXAMPLE 6

4-(1-Methyl-1,2,3,4-tetrazol-5-yl)thio-butyric acid (45 mmole) is dissolved in tetrahydrofuran (50 ml), and thereto is added DBU (50 mmole). To the mixture is added dropwise with stirring isobutyl chloroformate (50 mmole) under ice-cooling and the mixture is stirred at room temperature for 30 minutes. To the mixture is added dropwise 2-(3,4-dimethoxyphenyl)ethylamine (54 mmole) and the mixture is further stirred at room temperature for 2 hours. After the solvent is distilled off under reduced pressure, the resulting residue is extracted with chloroform. The chloroform layer is washed with 5% aqueous hydrochloric acid, an aqueous saturated sodium hydrogen carbonate solution and an aqueous saturated sodium chloride solution and dried over anhydrous sodium sulfate. After distilling off chloroform, the residue is subjected to column chromatography (Wakogel C-200, eluting agent, chloroform) to isolate N-[2-(3,4-dimethoxyphenyl)ethyl]-4-(1-methyl-1,2,3,4-tetrazol-5-yl)thio-butyramide (yield: 41%) which is recrystallized from hexane-chloroform, colorless flaks, m.p. 70.5°-71.5° C.

Elementary analysis for C₁₆ H₂₃ N₅ O₃ S: Calcd. (%): C, 52.59; H, 6.34; N, 19.16. Found (%): C, 52.51; H, 6.16; N, 19.10.

EXAMPLES 7 TO 58

In the same manner as described in Example 6, the following compounds are prepared from appropriate starting materials.

(7) N-Hexyl-4-(1-methyl-1,2,3,4-tetrazol-5-yl)-thio-butyramide, colorless flaks (recrystallized from hexane-ether), m.p. 41°-42° C.

(8) N-Cyclohexyl-4-(1-methyl-1,2,3,4-tetrazol-5-yl)thio-butyramide, colorless needles (hexane-ethyl acetate), m.p. 116.5°-117.5° C.

(9) N-Cyclooctyl-4-(1-methyl-1,2,3,4-tetrazol-5-yl)thio-butyramide, colorless liquid, n_(D) ¹⁴ =1.5323

(10) N-Cyclododecanyl-4-(1-methyl-1,2,3,4-tetrazol-yl)thio-butyramide, colorless needles (hexane-ethyl acetate), m.p. 119°-120° C.

(11) N-Butyl-4-(1-methyl-1,2,3,4-tetrazol-5-yl)thio-butyramide, colorless liquid, n_(D) ¹⁶.5 =1.5198

(12) N-(2-Hydroxyethyl)-4-(1-methyl-1,2,3,4-tetrazol-5-yl)thio-butyramide, colorless liquid, n_(D) ¹⁴.5 =1.5350

(13) N-Ethyl-N-benzyl-4-(1-methyl-1,2,3,4-tetrazol-yl)thio-butyramide, colorless liquid, n_(D) ¹⁹ =1.5596

(14) N-Butyl-N-cyclohexyl-4-(1-methyl-1,2,3,4-tetrazol-5-yl)thio-butyramide, colorless liquid, n_(D) ¹⁹ =1.5222

(15) N,N-Dibutyl-4-(1-methyl-1,2,3,4-tetrazol-5-yl)thio-butyramide, colorless liquid, n_(D) ¹⁹ =1.5049

(16) N,N-Dibenzyl-4-(1-methyl-1,2,3,4-tetrazol-5-yl)thio-butyramide, colorless liquid, n_(D) ¹⁹ =1.5773

(17) N,N-Diisopropyl-4-(1-methyl-1,2,3,4-tetrazol-5-yl)thio-butyramide, colorless liquid, n_(D) ¹⁹.5 =1.5111

(18) N,N-Dicyclohexyl-4-(1-methyl-1,2,3,4-tetrazol-5-yl)thio-butyramide, colorless needles (hexane), m.p. 91°-92° C.

(19) N-Benzyl-N-tert-butyl-4-(1-methyl-1,2,3,4-tetrazol-5-yl)thio-butyramide, colorless needles (hexane), m.p. 86.5°-87.5° C.

(20) N-Cyclohexyl-N-[2-(3,4-dimethoxyphenyl)ethyl]-4-(1-methyl-1,2,3,4-tetrazol-5-yl)thio-butyramide, colorless liquid, n_(D) ¹⁶ =1.5470

(21) N-Methyl-N-(2-thienylmethyl)-4-(1-methyl-1,2,3,4-tetrazol-5-yl)thio-butyramide, colorless liquid, n_(d) ¹⁶ =1.5706

(22) N-Benzyl-N-[2-(3,4-dimethoxyphenyl)ethyl]-4-(1-methyl-1,2,3,4-tetrazol-5-yl)thio-butyramide, colorless liquid, n_(D) ¹⁶ =1.5659

(23) N-Cyclohexyl-N-(2-hydroxyethyl)-4-(1-methyl-1,2,3,4-tetrazol-5-yl)thio-butyramide, colorless liquid, n_(D) ¹⁴.5 =1.5372

(24) N,N-Dihexyl-4-(1-methyl-1,2,3,4-tetrazol-5-yl)thio-butyramide, colorless liquid, n_(D) ¹⁵ =1.5011

(25) N-Ethyl-N-[2-(3,4-dimethoxyphenyl)ethyl]-4-(1-methyl-1,2,3,4-tetrazol-5-yl)thio-butyramide, colorless liquid, n_(D) ¹⁴ =1.5451

(26) N-tert-Butyl-4-(1-methyl-1,2,3,4-tetrazol-5-yl)thio-butyramide, colorless plates (hexane-ethyl acetate), m.p. 71°-73° C.

(27) N-Ethyl-4-(1-methyl-1,2,3,4-tetrazol-5-yl)thio-butyramide, colorless liquid, n_(D) ¹⁵ =1.5319

(28) N-Benzyl-4-(1-methyl-1,2,3,4-tetrazol-5-yl)thio-butyramide, colorless needles (hexane-ethyl acetate), m.p. 65°-66° C.

(29) N-Hexyl-N-cyclohexyl-4-(1-methyl-1,2,3,4-tetrazol-5-yl)thio-butyramide, colorless liquid, n_(D) ¹⁶ =1.5182

(30) N-Cyclohexyl-N-(2-hydroxyethyl)-4-(1-methyl-1,2,3,4-tetrazol-5-yl)thio-butyramide, colorless liquid, n_(D) ¹⁴.5 =1.5372

(31) N-Phenyl-4-(1-methyl-1,2,3,4-tetrazol-5-yl)thio-butyramide, colorless needles (hexane-ethyl acetate), m.p. 106°-107° C.

(32) N-(2-Pyridyl)-4-(1-methyl-1,2,3,4-tetrazol-5-yl)thio-butyramide, colorless needles (hexane-ethyl acetate), m.p. 95°-96° C.

(33) N-(3-Pyridyl)-4-(1-methyl-1,2,3,4-tetrazol-5-yl)thio-butyramide, colorless plates (ethyl acetate), m.p. 110.5°-113° C.

(34) N-(2-Pyrimidyl)-4-(1-methyl-1,2,3,4-tetrazol-5-yl)thio-butyramide, colorless granules (hexane-ethyl acetate), m.p. 108°-110° C.

(35) N-Furfuryl-4-(1-methyl-1,2,3,4-tetrazol-5-yl)thio-butyramide, colorless flaks (hexane-ethyl acetate), m.p. 71°-73° C.

(36) N-(4-Aminosulfonylphenyl)-4-(1-methyl-1,2,3,4-tetrazol-5-yl)thio-butyramide, colorless needles (methanol), m.p. 169.5°-170.5° C.

(37) N-[4-(N,N-Dimethylamino)phenyl]-4-(1-methyl-1,2,3,4-tetrazol-5-yl)thio-butyramide, colorless prisms (hexane-ethyl acetate), m.p. 144°-147° C.

(38) N-(2-Methyl-3-chlorophenyl-4-(1-methyl-1,2,3,4-tetrazol-5-yl)thio-butyramide, colorless needles (hexane-ethyl acetate), m.p. 104.5°-105.5° C.

(39) N-(4-Nitrophenyl)-4-(1-methyl-1,2,3,4-tetrazol-5-yl)thio-butyramide, colorless needles (ethyl acetate), m.p. 194°-195° C.

(40) N-(2-Methoxyphenyl)-4-(1-methyl-1,2,3,4-tetrazol-5-yl)thio-butyramide, colorless needles (hexane-ethyl acetate), m.p. 79.5°-82° C.

(41) N-Methyl-N-(2-tetrahydropyranyl)-4-(1-methyl-1,2,3,4-tetrazol-5-yl)thio-butyramide, colorless liquid, n_(D) ¹⁴ =1.5273

(42) N-Ethyl-N-(2-pyridyl)-4-(1-methyl-1,2,3,4-tetrazol-5-yl)thio-butyramide, colorless liquid, n_(D) ¹⁶ =1.5623

(43) N-Ethyl-N-(3-pyridyl)-4-(1-methyl-1,2,3,4-tetrazol-5-yl)thio-butyramide, colorless liquid, n_(D) ¹⁶ =1.5618

(44) N-Ethyl-N-cyclopentyl-4-(1-methyl-1,2,3,4-tetrazol-5-yl)thio-butyramide, colroless liquid, n_(D) ⁹ =1.5384

(45) N-Ethyl-N-cyclohexylmethyl-4-(1-methyl-1,2,3,4-tetrazol-5-yl)thio-butyramide, colorless liquid, n_(D) ¹¹ =1.5293

(46) N-Isopropyl-N-cyclohexyl-4-(1-methyl-1,2,3,4-tetrazol-5-yl)thio-butyramide, colorless liquid, n_(D) ¹⁵ =1.5238

(47) N-Ethyl-N-(4-hydroxycyclohexyl)-4-(1-methyl-1,2,3,4-tetrazol-5-yl)thio-butyramide, colorless liquid, n_(D) ⁹ =1.5363

(48) N-Ethyl-N-(2-hydroxycyclohexyl)-4-(1-methyl-1,2,3,4-tetrazol-5-yl)thio-butyramide, colorless needles (hexane-ethyl acetate), m.p. 132°-133° C.

(49) N-Ethyl-N-(2-acetyloxycyclohexyl)-4-(1-methyl-1,2,3,4-tetrazol-5-yl)thio-butyramide, colorless liquid, n_(D) ¹¹ =1.5218

(50) N,N-Dipropyl-4-(1-methyl-1,2,3,4-tetrazol-5-yl)thio-butyramide, colorless liquid n_(D) ¹⁵ =1.5151

(51) N-Butyl-N-phenyl-4-(1-methyl-1,2,3,4-tetrazol-5-yl)thio-butyramide, colorless liquid, n_(D) ¹⁵ =1.5509

(52) N-Methyl-N-cyclohexyl-4-(1-methyl-1,2,3,4-tetrazol-5-yl)thio-butyramide, pale yellow liquid

NMR: δ_(ppm) ^(CCl).sbsp.4 1.00-2.00 (10H, br.), 1.80-2.70 (4H, m), 2.73 (3H, d, J=6 Hz), 3.28 (2H, t, J=6 Hz), 3.85 (3H, s), 3.20-4.50 (1H, m),

(53) N,N-Dimethyl-4-(1-methyl-1,2,3,4-tetrazol-5-yl)thio-butyramide, colorless liquid, n_(D) ¹⁶ =1.5327

(54) N-Ethyl-N-cyclooctyl-4-(1-methyl-1,2,3,4-tetrazol-5-yl)thio-butyramide, colorless liquid, n_(D) ¹⁶ =1.5309

(55) 5-[3-(4-Methylpiperazinocarbonyl)propylthio]-1-methyl-1,2,3,4-tetrazol, colorless flaks (hexane-ethyl acetate), m.p. 65°-68° C.

(56) 5-(3-Piperidinocarbonylpropylthio)-1-methyl-1,2,3,4-tetrazole, colorless liquid, n_(D) ²⁵ =1.5310

(57) N-Ethyl-N-cycloheptyl-4-(1-methyl-1,2,3,4-tetrazol-5-yl)thio-butyramide, colorless liquid, n_(D) ¹⁸ =1.5290

EXAMPLE 58

4-(1-Phenyl-1,2,3,4-tetrazol-5-yl)thio-butyric acid (45 mmol) is dissolved in tetrahydrofuran (50 ml) and thereto is added DBU (50 mmole). To the mixture is added dropwise with stirring isobutyl chloroformate (50 mmole) under ice-cooling. The mixture is stirred at room temperature for 30 minutes. To the mixture is added dropwise N-ethylcyclohexylamine (54 mmole) and the mixture is further stirred at room temperature for 2 hours. After distilling off the solvent under reduced pressure, the residue is extracted with chloroform. The chloroform layer is washed with 5% aqueous hydrochloric acid, an aqueous saturated sodium hydrogen carbonate solution and an aqueous saturated sodium chloride solution and dried over anhydrous sodium sulfate. Chloroform is distilled off and the resulting residue is subjected to column chromatogrophy (Wakogel C-200, eluting solvent, chloroform) to isolate N-ethyl-N-cyclohexyl-4-(1-phenyl-1,2,3,4-tetrazol-5-yl)thio-butyramide (yield: 43%), colorless liquid, n_(D) ¹⁸ =1.5590.

Elementary analysis for C₁₉ H₂₇ N₅ OS: Calcd. (%): C, 61.10; H, 7.29; N, 18.75. Found (%): C, 61.28; H, 7.38; N, 18.86.

EXAMPLE 59

In the same manner as described in Example 58 except that N,N-diethylamine is used instead of N-ethyl-N-cyclohexylamine, there is obtained N,N-diethyl-4-(1-phenyl-1,2,3,4-tetrazol-5-yl)thio-butyramide, colorless liquid, n_(D) ¹⁸ =1.5592.

EXAMPLE 60

2-(1-Methyl-1,2,3,4-tetrazol-5-yl)thio-acetic acid (45 mmole) is dissolved in tetrahydrofuran (50 ml) and thereto is added DBU (50 mmole). To the mixture is added dropwise with stirring isobutyl chloroformate (50 mmole) under ice-cooling and the mixture is stirred at room temperature for 30 minutes. To the mixture is added dropwise N-ethyl-cyclohexylamine under ice-cooling, and the mixture is further stirred at room temperature for 2 hours. After distilling off the solvent under reduced pressure, the resulting residue is extracted with chloroform. The chloroform layer is washed with 5% aqueous hydrochloric acid, an aqueous saturated sodium hydrogen carbonate solution and an aqueous saturated sodium chloride solution and dried over anhydrous sodium sulfate. Chloroform is distilled off and the residue is subjected to column chromatography (Wakogel C-200, eluting solvent, benzene:chloroform=4:1, V/V) to isolate N-ethyl-N-cyclohexyl-2-(1-methyl-1,2,3,4-tetrazol-5-yl)thio-acetamide (yield: 52%) which is recrystallized from ether-petroleum ether, white prisms, m.p. 69°-71° C.

Elementary analysis for C₁₂ H₂₁ N₅ OS: Calcd. (%): C, 50.86; H, 7.47; N, 24.71. Found (%): C, 50.75; H, 7.55; N, 24.78.

EXAMPLES 61 AND 62

In the same manner as described in Example 60, the following compounds are prepared by using appropriate starting materials.

(61) N-Ethyl-N-cyclohexyl-3-(1-methyl-1,2,3,4-tetrazol-5-yl)thio-propionamide, pale yellow liquid, n_(D) ²⁶ =1.5273

(62) N-Ethyl-N-cyclohexyl-5-(1-methyl-1,2,3,4-tetrazol-5-yl)thio-valeramide, pale yellow liquid, n_(D) ²⁵ =1.5227

EXAMPLE 63

4-(1-Cyclohexyl-1,2,3,4-tetrazol-5-yl)thiobutyric acid (45 mmole) is dissolved in tetrahydrofuran (50 ml) and thereto is added DBU (50 mmole). To the mixture is added dropwise with stirring isobutyl chloroformate under ice-cooling, and the mixture is stirred at room temperature for 30 minutes. To the mixture is added dropwise N-ethyl-cyclohexylamine (54 mmole), and the mixture is further stirred at room temperature for 2 hours. After distilling off the solvent under reduced pressure, the residue is extracted with chloroform. The chloroform layer is washed with 5% aqueous hydrochloric acid, an aqueous saturated sodium hydrogen carbonate and an aqueous saturated sodium chloride solution and dried over anhydrous sodium sulfate. Chloroform is distilled off and the resulting residue is subjected to column chromatography (Wakogel C-200, eluting solvent, benzene:chloroform=4:1, V/V) to isolate N-ethyl-N-cyclohexyl-4-(1-cyclohexyl-1,2,3,4-tetrazol-5-yl)thiobutyramide (yield: 47%), colorless liquid, n_(D) ¹⁸ =1.5290.

Elementary analysis for C₁₉ H₃₃ N₅ OS: Calcd. (%): C, 60.12; H, 8.76; N, 18.45. Found (%): C, 59.95; H, 8.62; N, 18.55.

EXAMPLE 64

To methylene chloride (50 ml) are added 4-(1-methyl-1,2,3,4-tetrazol-5-yl)thio-butyric acid (45 mmole) and N-methylmorpholine (50 mmole). To the mixture is added dropwise with stirring methyl chloroformate (50 mmole) with keeping the inner temperature at 10°-20° C. by ice-cooling, and thereafter, the mixture is stirred at room temperature for 30 minutes. To the mixture is added 2-methoxycyclohexylamine (54 mmole), and the mixture is stirred at the same temperature for 4 hours. After the reaction, water is added to the reaction mixture. The organic layer is separated and washed with dilute aqueous sodium hydroxide solution, diluted hydrochloric acid and water in order, and dried over sodium sulfate. Inorganic materials are filtered off, and the mother liquor is concentrated. The resulting residue is subjected to column chromatography (Wakogel C-200, eluting solvent, benzene:chloroform=4:1, V/V) to isolate N-(4-methoxycyclohexyl)-4-(1-methyl-1,2,3,4-tetrazol-5-yl)thio-butyramide (yield: 43%), colorless liquid, n_(D) ¹¹ =1.5263.

Elementary analysis for C₁₃ H₂₃ N₅ O₂ S: Calcd. (%): C, 52.50; H, 7.79; N, 23.55. Found (%): C, 52.56; H, 7.71; N, 23.63.

EXAMPLE 65

To tetrahydrofuran (50 ml) are added 4-(1-methyl-1,2,3,4-tetrazol-5-yl)thio-butyric acid (45 mmole) and pyridine (50 mmole), and thereto is added dropwide with stirring methyl bromoformate (50 mmole) with keeping the inner temperature at 5°-15° C. by ice-cooling, and thereafter, the mixture is stirred at room temperature for one hour. To the mixture is added 4-methylcyclohexylamine (55 mmole), and the mixture is further stirred for 3 hours. After the reaction, the solvent is distilled off under reduced pressure, and the residue is dissolved in chloroform. The chloroform layer is washed with dilute aqueous sodium hydroxide solution, diluted hydrochloric acid and water in order, and dried over sodium sulfate. Inorganic materials are filtered off and the mother liquor is concentrated. The resulting residue is subjected to column chromatography (Wakogel C-200, eluting solvent, benzene:chloroform=4:1, V/V) to isolate N-(4-methylcyclohexyl)-4-(1-methyl-1,2,3,4-tetrazol-5-yl)thio-butyramide (yield: 45%).

Elementary analysis for C₁₃ H₂₃ N₅ OS: Calcd. (%): C, 52.50; H, 7.79; N, 23.55. Found (%): C, 52.31; H, 7.65; N, 23.80.

EXAMPLE 66

4-(1-Methyl-1,2,3,4-tetrazol-5-yl)thio-butyric acid (45 mmole) is dissolved in tetrahydrofuran (50 ml), and thereto is added DBU (50 mmole). To the mixture is added dropwise with stirring isobutyl chloroformate (50 mmole) under ice-cooling, and the mixture is stirred at room temperature for 30 minutes. To the mixture is added dropwise 4-(N,N-dimethylamino)cyclohexylamine (54 mmole), and the mixture is further stirred at room temperature for 2 hours. After distilling off the solvent under reduced pressure, the resulting residue is extracted with chloroform. The chloroform layer is washed with 5% aqueous hydrochloric acid, an aqueous saturated sodium hydrogen carbonate solution and an aqueous saturated sodium chloride solution and then dried over anhydrous sodium sulfate. Chloroform is distilled off, and the resulting residue is subjected to silica gel column chromatography (Wakogel C-200, eluting solvent, benzene:chloroform=4:1, V/V) to isolate N-[4-(N,N-dimethylamino)cyclohexyl]-4-(1-methyl-1,2,3,4-tetrazol-5-yl)thiobutyramide (yield: 47%).

Elementary analysis for C₁₄ H₂₆ N₆ OS: Calcd. (%): C, 51.51; H, 8.03; N, 25.74. Found (%): C, 51.60; H, 8.22; N, 26.05.

EXAMPLE 67

4-[1-(2-Methoxycyclohexyl)-1,2,3,4-tetrazol-5-yl]thio-butyric acid (45 mmole) is dissolved in tetrahydrofuran (50 ml), and thereto is added DBU (50 mmole). To the mixture is added dropwise with stirring isobutyl chloroformate (50 mmole) under ice-cooling, and the mixture is stirred at room temperature for 30 minutes. To the mixture is added dropwise N-ethyl-cyclohexylamine (54 mmole), and the mixture is further stirred at room temperature for 2 hours. The solvent is distilled off under reduced pressure, and the residue is extracted with chloroform. The chloroform layer is washed with 5% aqueous hydrochloric acid, an aqueous saturated sodium hydrogen carbonate solution and an aqueous saturated sodium chloride solution and then dried over anhydrous sodium sulfate. After distilling off chloroform, the resulting residue is subjected to column chromatography (Wakogel C-200, eluting solvent, benzene:chloroform=4:1, V/V) to isolate N-ethyl-N-cyclohexyl-4-[1-(2-methoxycyclohexyl)-1,2,3,4-tetrazol-5-yl]thiobutyramide (yield: 45%).

Elementary analysis for C₂₀ H₃₅ N₅ O₂ S: Calcd. (%): C, 58.65; H, 8.61; N, 17.10. Found (%): C, 58.25; H, 8.34; N, 17.20.

EXAMPLE 68

4-[1-(4-Ethylphenyl)-1,2,3,4-tetrazol-5-yl]thio-butyric acid (45 mmole) is dissolved in tetrahydrofuran (50 ml), and thereto is added DBU (50 mmole). To the mixture is added dropwise with stirring isobutyl chloroformate (50 mmol) under ice-cooling, and the mixture is stirred at room temperature for 30 minutes. To the mixture is added dropwise N-ethyl-cyclohexylamine (54 mmole), and the mixture is further stirred at room temperature for 2 hours. The solvent is distilled off under reduced pressure and the resulting residue is extracted with chloroform. The chloroform layer is washed with 5% aqueous hydrochloric acid, an aqueous saturated sodium hydrogen carbonate solution and an aqueous saturated sodium chloride solution and then dried over anhydrous sodium sulfate. Chloroform is distilled off and the resulting residue is subjected to column chromatography (Wakogel C-200, eluting solvent, benzene:chloroform=4:1, V/V) to isolate N-ethyl-N-cyclohexyl-4-[1-(4-ethylphenyl)-1,2,3,4-tetrazol-5-yl]thio-butyramide (yield: 43%), colorless liquid, n_(D) ¹⁹ =1.5533.

Elementary analysis for C₂₁ H₃₁ N₅ OS: Calcd. (%): C, 62.81; H, 7.78; N, 17.44. Found (%): C, 63.05; H, 7.84; N, 17.81.

EXAMPLE 69

5-(1-Phenyl-1,2,3,4-tetrazol-5-yl)valeric acid (2.5 g) is dissolved in dimethylformamide (50 ml), and thereto is added triethylamine (1.1 g). To the mixture is added dropwise with stirring isobutyl chloroformate (1.5 g) under ice-cooling, and the mixture is stirred at room temperature for 30 minutes. To the mixture is added dropwise with stirring diethylamine (0.9 g) at room temperature, and the mixture is stirred for 2 hours. After distilling off dimethylformamide under reduced pressure, acetone is added to the resulting residue, and the insoluble materials are filtered off. The mother liquor is concentrated and then purified by column chromatography (Kieselgel 60, made by Merck & Co.). By eluting with chloroform, there is obtained N,N-diethyl-5-(1-phenyl-1,2,3,4-tetrazol-5-yl)valeramide (1.2 g), colorless liquid, n_(D) ²⁵ =1.5303.

Elementary analysis for C₁₆ H₂₃ N₅ O: Calcd. (%): C, 56.40; H, 6.63; N, 21.92. Found (%): C, 56.69; H, 6.80; N, 21.71.

EXAMPLE 70

5-(1-Cyclohexyl-1,2,3,4-tetrazol-5-yl)valeric acid (2.5 g) is dissolved in tetrahydrofuran (50 ml), and thereto is added triethylamine (1.1 g). To the mixture is added dropwise with stirring isobutyl chloroformate (1.5 g) under ice-cooling, and the mixture is stirred at room temperature for 30 minutes. To the mixture is added dropwise with stirring N-ethyl-cyclohexylamine (1.5 g) at room temperature, and the mixture is further stirred for 2 hours. After distilling off tetrahydrofuran, water is added to the residue, and the mixture is extracted with chloroform. The chloroform layer is washed with an aqueous saturated sodium chloride solution and dried over magnesium sulfate. Chloroform is distilled off, and the resulting residue is subjected to column chromatography (Kieselgel 60, made by Merck & Co., eluting solvent, chloroform) to isolate N-ethyl-N-cyclohexyl-5-(1-cyclohexyl-1,2,3,4-tetrazol-5-yl)valeramide (2.6 g), white crystalline powder (ether), m.p. 92°-95° C.

Elementary analysis for C₂₀ H₃₅ N₅ O: Calcd. (%): C, 66.44; H, 9.76; N, 19.37. Found (%): C, 66.78; H, 9.56; N, 19.52.

EXAMPLE 71

(5-(1-Methyl-1,2,3,4-tetrazol-5-yl)valeric acid (1.8 g) is dissolved in dimethylformamide (50 ml), and thereto is added triethylamine (1.1 g). To the mixture is added dropwise with stirring isobutyl chloroformate (1.5 g) under ice-cooling, and the mixture is stirred at room temperature for 30 minutes. To the mixture is added dropwise with stirring diethylamine (0.9 g) at rood temperature, and the mixture is stirred for 2 hours. Dimethylformamide is distilled off under reduced pressure, and the residue is purified by column chromatography (Wakogel C-200). After eluting with benzene-chloroform (1:1), the eluate is distilled under reduced pressure to give N,N-diethyl-5-(1-methyl-1,2,3,4-tetrazol-5-yl)valeramide (0.7 g), colorless liquid, b.p. 190°-200° C. (bath temperature)/0.07 mmHg, n_(D) ²⁵ =1.4907.

Elementary analysis for C₁₁ H₂₁ N₅ O: Calcd. (%): C, 55.20; H, 8.85; H, 29.27. Found (%): C, 55.48; H, 8.98; N, 29.43.

EXAMPLES 72 TO 76

In the same manner as described in Example 71, the following compounds are prepared by using appropriate starting materials.

(72) N,N-Diethyl-5-(1-cyclohexyl-1,2,3,4-tetrazol-5-yl)valeramide, colorless liquid, n_(D) ²⁵ =1.4970

(73) N,N-Diethyl-5-(1,2,3,4-tetrazol-5-yl)valeramide, colorless liquid, n_(D) ²⁵ =1.4867

(74) N-Ethyl-N-cyclohexyl-5-(1-methyl-1,2,3,4-tetrazol-5-yl)valeramide, colorless liquid, N_(D) ¹⁸ =1.5085

(75) N-Ethyl-N-cyclohexyl-5-(1-cyclohexyl-1,2,3,4-tetrazol-5-yl)valeramide, white crystalline powder (ether), m.p. 92°-95° C.

(76) N-Ethyl-N-cyclohexyl-5-(1-phenyl-1,2,3,4-tetrazol-5-yl)valeramide, white prisms (ether), m.p. 73°-75° C.

EXAMPLE 77

3-(1-Methyl-1,2,3,4-tetrazol-5-yl)methylthiopropionic acid (2 g) is dissolved in tetrahydrofuran (50 ml), and thereto is added triethylamine (1.1 g). To the mixture is added dropwise with stirring isobutyl chloroformate (1.5 g) under ice-cooling, and the mixture is stirred at room temperature for 30 minutes. To the mixture is added dropwise with stirring diethylamine (0.9 g) at the same temperature, and the mixture is further stirred for 3 hours. After distilling off the solvent, the resulting residue is subjected to column chromatography (Kieselgel 60, made by Merck & Co., eluting solvent, chloroform:methanol=50:1, V/V) to isolate N,N-diethyl-3-(1-methyl-1,2,3,4-tetrazol-5-yl)methylthio-propionamide (1.5 g), colorless liquid, n_(D) ²⁵ =1.5200.

Elementary analysis for C₁₀ H₁₉ N₅ OS: Calcd. (%): C, 46.67; H, 7.44; N, 27.21. Found (%): C, 46.85; H, 7.61; N, 27.39.

EXAMPLES 78 TO 80

In the same manner as described in Example 77, the following compounds are prepared by using appropriate starting materials.

(78) N,N-Diethyl-3-(1-ethyl-1,2,3,4-tetrazol-5-yl)methylthio-propionamide, colorless needles (recrystallized from ether), m.p. 58°-59° C.

(79) N,N-Diethyl-3-[1-(4-ethylphenyl)-1,2,3,4-tetrazol-5-yl)methylthio-propionamide, colorless liquid, n_(D) ²⁵ =1.5499

(80) N-Ethyl-N-cyclohexyl-3-(1-ethyl-1,2,3,4-tetrazol-5-yl)methylthio-propionamide, pale yellow liquid, n_(D) ¹⁸ =1.5277.

EXAMPLE 81

Thionyl chloride (10 ml) is added to 4-(1-methyl-1,2,3,4-tetrazol-5-yl)thio-butyric acid (2 g) and the mixture is refluxed for 1 hour. After excess thionyl chloride is distilled off under reduced pressure, dry benzene is added to the residue and the remaining smaller amount of thionyl chloride is removed as the benzene azeotrope. The residue is dissolved in dry benzene (50 ml) and therto is added dropwise with stirring N-methylcyclohexylamine (2.8 g) under ice-cooling. The mixture is stirred at room temperature for 1 hour and benzene is added to the reaction mixture. The mixture is washed with dilute hydrochloric acid, aqueous saturated sodium bicarbonate solution and them, saturated aqueous sodium chloride solution and dried over sodium sulfate. After benzene is distilled off, the residue is subjected to column chromatography (Wakogel C-200) by eluting the column with benzene-chloroform (4:1, V/V) to give N-methyl-N-cyclohexyl-4-(1-methyl-1,2,3,4-tetrazol-5-yl)thio-butyramide (2.3 g), pale yellow liquid.

NMR: δ_(ppm) ^(CCl).sbsp.4 1.00-2.00 (10H, br.), 1.80-2.70 (4H, m), 2.73 (3H, d, J=6 Hz), 3.28 (2H, t, J=6 Hz), 3.85 (3H, s), 3.20-4.50 (1H, m).

Elementary analysis for C₁₃ H₂₃ N₅ OS: Calcd. (%): C, 52.50; H, 7.79; N, 23.55. Found (%): C, 52.69; H, 7.83; N, 23.51.

EXAMPLES 82 TO 100

According to the same procedure as described in Example 81, the following compounds are obtained.

(82) N-Ethyl-N-cyclohexyl-4-(1-methyl-1,2,3,4-tetrazol-5-yl)thio-butyramide, colorless liquid, n_(D) ¹⁷.5 =1.5327

(83) N-Ethyl-N-phenyl-4-(1-methyl-1,2,3,4-tetrazol-5-yl)thio-butyramide, pale yellow liquid, n_(D) ²⁶ =1.5534

(84) 5-(3-Morpholinocarbonylpropylthio)-1-methyl-1,2,3,4-tetrazole, white needles (recrystallized from petroleum ether-ethanol), m.p. 71°-73° C.

(85) 5-[3-(4-Acetylpiperazino-carbonyl)propylthio]-1-methyl-1,2,3,4-tetrazole, white crystalline powder (recrystallized from ligroine-acetone), m.p. 90°-91.5° C.

(86) N-[2-(3,4-Dimethoxyphenylethyl]-4-(1-methyl-1,2,3,4-tetrazol-5-yl)thio-butyramide, colorless flaks (recrystallized from hexane-ethyl acetate), m.p. 70.5°-71.5° C.

(87) N-(2-Hydroxyethyl)-4-(1-methyl-1,2,3,4-tetrazol-5-yl)thio-butyramide, colorless liquid, n_(D) ¹⁴.5 =1.5350

(88) N-Ethyl-N-benzyl-4-(1-methyl-1,2,3,4-tetrazol-5-yl)thio-butyramide, colorless liquid, n_(D) ¹⁹ =1.5596

(89) N-Cyclohexyl-N-[2-(3,4-dimethoxyphenyl)ethyl]-4-(1-methyl-1,2,3,4-tetrazol-5-yl)thio-butyramide, colorless liquid, n_(D) ¹⁶ =1.5470

(90) N-Methyl-N-(2-thienylmethyl)-4-(1-methyl-1,2,3,4-tetrazol-5-yl)thio-butyramide, colorless liquid, n_(D) ¹⁶ =1.5706

(91) N-(2-Pyridyl)-4-(1-methyl-1,2,3,4-tetrazol-5-yl)thio-butyramide, colorless needles (hexane-ethyl acetate), m.p. 95°-96° C.

(92) N-Furfuryl-4-(1-methyl-1,2,3,4-tetrazol-5-yl)thio-butyramide, colorless flaks (hexane-ethyl acetate), m.p. 71°-73° C.

(93) N-[4-(N,N-Dimethylamino)phenyl]-4-(1-methyl-1,2,3,4-tetrazol-5-yl)thio-butyramide, colorless prisms (hexane-ethyl acetate), m.p. 144°-147° C.

(94) N-(2-Methyl-3-chlorophenyl)-4-(1-methyl-1,2,3,4-tetrazol-5-yl)thio-butyramide, colorless needles (hexane-ethyl acetate), m.p. 104.5°-105.5° C.

(95) N-Methyl-N-(2-tetrahydropyranyl)-4-(1-methyl-1,2,3,4-tetrazol-5-yl)thio-butyramide, colorless liquid, n_(D) ¹⁴ =1.5273

(96) N-Ethyl-N-cyclohexylmethyl-4-(1-methyl-1,2,3,4-tetrazol-5-yl)thio-butyramide, colorless liquid, n_(D) ¹¹ =1.5293

(97) N-Ethyl-N-(4-hydroxycyclohexyl)-4-(1-methyl-1,2,3,4-tetrazol-5-yl)thio-butylamide, colorless liquid, n_(D) ⁹ =1.5363

(98) N-Ethyl-N-(2-acetyloxycyclohexyl)-4-(1-methyl-1,2,3,4-tetrazol-5-yl)thio-butyramide, colorless liquid, n_(D) ¹¹ =1.5218

(99) 5-(3-Piperidinocarbonylpropylthio)-1-methyl-1,2,3,4-tetrazole, colorless liquid, n_(D) ²⁵ =1.5310

(100) N-Ethyl-N-cyclohexyl-4-(1-phenyl-1,2,3,4-tetrazol-5-yl)thio-butyramide, colorless liquid, n_(D) ¹⁸ =1.5590

EXAMPLE 101

Thionyl chloride (10 ml) is added to 5-(1-phenyl-1,2,3,4-tetrazol-5-yl)valeric acid (1.8 g) and the mixture is refluxed for 1 hour. After excess thionyl chloride is distilled off under reduced pressure, dry benzene is added to the residue and the remaining small amount of thionyl chloride is removed as the benzene azeotrope. The resulting residue is dissolved in dry pyridine (50 ml) and thereto is added dropwise with stirring N,N-Diethylamine (1.5 g) under ice-cooling. The mixture is stirred at room temperature for 1 hour and benzene is added to the reaction mixture. The mixture is washed with diluted hydrochloric acid, aqueous saturated sodium bicarbonate solution and aqueous saturated sodium chloride solution and dried over sodium sulfate. After benzene is distilled off, the residue is subjected to column chromatography (Kieselgel 60 produced by Merck) by eluting the column with chloroform to give N,N-diethyl-5-(1-phenyl-1,2,3,4-tetrazol-5-yl)valeramide (2.1 g), colorless liquid, n_(D) ²⁵ =1.5303.

Elementary analysis for C₁₆ H₂₃ N₅ O: Calcd. (%): C, 63.76; H, 7.69; N, 23.24. Found (%): C, 63.88; H, 7.79; N, 23.31.

EXAMPLES 102 TO 104

According to the same procedure as described in Example 101, the following compounds are obtained.

(102) N-Ethyl-N-cyclohexyl-5-(1-cyclohexyl-1,2,3,4-tetrazol-5-yl)valeramide, white crystalline powder (recrystallized from ether), m.p. 92°-95° C.

(103) N-Ethyl-N-cyclohexyl-5-(1-methyl-1,2,3,4-tetrazol-5-yl)valeramide, colorless liquid, n_(D) ¹⁸ =1.5085

(104) N-Ethyl-N-cyclohexyl-5-(1-phenyl-1,2,3,4-tetrazol-5-yl)valeramide, white prisms (ether), m.p. 73°-75° C.

EXAMPLE 105

1-Methyl-5-mercapto-1,2,3,4-tetrazole (11.6 g) is dissolved in acetone (100 ml) and thereto are added methyl 4-bromobutyrate (21.7 g) and potassium carbonate (15 g). The mixture is refluxed for 4 hours. After acetone is distilled off under reduced pressure, water is added to the resulting residue and the aqueous mixture is extracted with chloroform. The chloroform solution is washed with aqueous saturated sodium chloride solution and dried over magnesium sulfate. After chloroform is distilled off, the residue is subjected to column chromatogrophy (Wakogel C-200) by eluting the column with benzene-ether (5:1, V/V). The eluate is distilled under reduced pressure to give methyl 4-(1-methyl-1,2,3,4-tetrazol-5-yl)thio-butyrate (20 g), colorless liquid, b.p. 175°-177° C./0.8 mmHg, n_(D) ²⁶ =1.5083.

Elementary analysis for C₇ H₁₂ N₄ OS: Calcd. (%): C, 38.88; H, 5.59; N, 25.91. Found (%): C, 38.98; H, 5.67; N, 25.83.

EXAMPLES 106 AND 107

Substitution of 1-phenyl- or 1-cyclohexyl-5-mercapto-1,2,3,4-tetrazole for 1-methyl-5-mercapto-1,2,3,4-tetrazole in the procedure of Example 105 produces the following compounds.

(106) Methyl 4-(1-phenyl-1,2,3,4-tetrazol-5-yl)thio-butyrate, colorless liquid, n_(D) ¹⁸ =1.5654

(107) Methyl 4-(1-cyclohexyl-1,2,3,4-tetrazol-5-yl)thio-butyrate, pale yellow liquid, n_(D) ¹⁸ =1.5162

EXAMPLE 108

3-Mercaptopropionic acid (1.6 g) is dissolved in 1N aqueous sodium hydroxide solution (45 ml) and thereto is added dropwise a solution of 1-methyl-5-chloromethyl-1,2,3,4-tetrazole (15.2 g) in acetone (20 ml) with stirring under ice-cooling. Stirring is continued for 3 hours under ice-cooling. Acetone is distilled off and the residue is acidified with concentrated hydrochloric acid, saturated with sodium chloride and then, extracted with chloroform. The chloroform solution is dried over magnesium sulfate. After chloroform is distilled off, the residue is subjected to column chromatography (Kieselgel 60, made by Merck) by eluting the column with chloroform-methanol (10:1, V/V) to give 3-(1-methyl-1,2,3,4-tetrazol-5-yl)methylthio-propionic acid (2.1 g) as a colorless liquid.

NMR: δ_(ppm) ^(CDCl).sbsp.3 2.40-3.00 (4H, m), 4.05 (2H, s), 4.12 (3H, s), 9.79 (1H, s).

Elementary analysis for C₆ H₁₀ N₄ O₂ S: Calcd. (%): C, 35.63; H, 4.98; N, 27.70. Found (%): C, 35.81; H, 4.83; N, 27.83.

EXAMPLES 109 AND 110

According to the same procedure as described in Example 108, the following compounds are obtained by using appropriate starting materials.

(109) 3-(1-Ethyl-1,2,3,4-tetrazol-5-yl)methylthio-propionic acid, colorless prisms (acetone-ether), m.p. 68°-70° C.

(110) 3-[1-(4-Ethylphenyl)-1,2,3,4-tetrazol-5-yl]methylthio-propionic acid, colorless liquid, NMR: δ_(ppm) ^(CDCl).sbsp.3 1.28 (3H, t, J=7 Hz), 2.40-3.10 (6H, m), 3.97 (2H, s), 7.43 (4H, br.s), 10.02 (1H, br.s).

EXAMPLE 111

Methyl N-phenyladipinamate (9 g) is dissolved in benzene (70 ml) and thereto is added phosphorus pentachloride (9 g) with stirring at below 15° C. The mixture is stirred at room temperature for 1.5 hours and concentrated to 1/3 by volume under reduced pressure. A solution of hydrogen azide in benzene (0.0172 mol/10 ml, 44.2 ml) is added dropwise to the resulting iminochloride solution with stirring under ice-cooling. The mixture is stirred at room temperature for 1 hour, allowed to stand overnight and thereafter gently refluxed for 2 hours. The reaction mixture is concentrated, and thereto is added ice-water (50 ml) and the mixture is extracted with chloroform. The chloroform solution is washed with water, aqueous dilute sodium hydroxide solution and water and then dried over magnesium sulfate. Chloroform is distilled off and the residue is subjected to column chromatography (Wakogel C-200) by eluting the column with benzene-ether (5:1, V/V) to give methyl 5-(1-phenyl-1,2,3,4-tetrazol-5-yl)valerate (7.3 g) as a colorless liquid.

NMR: δ_(ppm) ^(CDCl).sbsp.3 1.50-2.10 (4H, m), 2.30 (2H, t, J=6 Hz), 2.90 (2H, t, J=6 Hz), 3.62 (3H, s), 7.30-7.70 (5H, m)

Elementary analysis for c₁₃ H₁₆ N₄ O₂ : Calcd (%): C, 59.98; H, 6.20; N, 21.53. Found (%): C, 60.19; H, 6.32; N, 21.71.

EXAMPLES 112 TO 114

According to the same procedure as described in Example 111, the following compounds are obtained by using appropriate starting materials.

(112) Methyl 5-(1-methyl-1,2,3,4-tetrazol-5-yl)valerate, colorless liquid, NMR: δ_(ppm) ^(CDCl).sbsp.3 1.50-2.20 (4H, m), 2.36 (2H, t, J=6 Hz), 2.90 (2H, t, J=6 Hz), 3.65 (3H, s), 4.05 (3H, s)

(113) Methyl 5-(1-cyclohexyl-1,2,3,4-tetrazol-5-yl)valerate, colorless liquid, NMR: δ_(ppm) ^(CDCl).sbsp.3 1.00-2.20 (14H, m), 2.38 (2H, t, J=6 Hz), 2.90 (2H, t, J=6 Hz), 3.70 (3H, s), 3.90-4.50 (1H, m)

(114) Methyl 5-(1,2,3,4-tetrazol-5-yl)valerate, colorless liquid, NMR: δ_(ppm) ^(CDCl).sbsp.3 1.50-2.20 (4H, m), 2.34 (2H, t, J=6 Hz), 3.02 (2H, t, J=6 Hz), 3.60 (3H, s)

EXAMPLE 115

20% aqueous Hydrochloric acid (100 ml) is added to methyl 5-(1-phenyl-1,2,3,4-tetrazol-5-yl)valerate (9.3 g) and the mixture is refluxed for 4 hours. After cooling, water is added and the mixture is extracted with chloroform. The chloroform solution is extracted with aqueous saturated sodium bicarbonate solution. The aqueous layer is acidified with concentrated hydrochloric acid and again extracted with chloroform. The latter chloroform extract is washed with aqueous saturated sodium chloride solution and dried over magnesium sulfate. Chloroform is distilled off to give 5-(1-phenyl-1,2,3,4-tetrazol-5-yl)valeric acid (8.2 g), pale yollow liquid.

NMR: δ_(ppm) ^(CDCl).sbsp.3 1.40-2.10 (4H, m), 2.33 (2H, t, J=6 Hz), 2.92 (2H, t, J=6 Hz), 7.30-7.70 (5H, m), 10.56 (1H, s)

Elementary analysis for C₁₂ H₁₄ N₄ O₂ : Calcd. (%): C, 58.52; H, 5.73; N, 22.75. Found (%): C, 58.61; H, 5.85; N, 22.88.

EXAMPLES 116 TO 118

According to the same procedure as described in Example 115, the following compounds are obtained by using the compounds of Examples 200 to 202 as the starting material.

(116) 5-(1-Methyl-1,2,3,4-tetrazol-5-yl)valeric acid, colorless prisms (ether-ethanol), m.p. 107°-109° C., NMR: δ_(ppm) ^(CDCl).sbsp.3 1.40∝2.20 (4H, m), 2.28 (2H, t, J=2.87 (2H, t, J=6 Hz), 4.02 (3H, s), 9.30 (1H, br.s)

(117) 5-(1-Cyclohexyl-1,2,3,4-tetrazol-5-yl)valeric acid, colorless prisms (recrystallized from ethanol-water), m.p. 100°-102° C.

(118) 5-(1,2,3,4-Tetrazol-5-yl)valeric acid, colorless liquid, NMR: δ_(ppm) ^(d).sbsp.6^(-DMSO) 1.30-2.00 (4H, m), 2.30 (2H, t, J=6 Hz), 2.87 (2H, t, J=6 Hz).

EXAMPLE 119

20% aqueous Hydrochloric acid (150 ml) is added to methyl 4-(1-methyl-1,2,3,4-tetrazol-5-yl)thiovalerate (17 g) and the mixture is refluxed for 2 hours. After cooling, the reaction mixture is diluted with water and extracted with chloroform. The chloroform solution is washed with aqueous saturated sodium chloride solution and dried over magnesium sulfate. Chloroform is distilled off to give 4-(1-methyl-1,2,3,4-tetrazol-5-yl)thio-valeric acid, colorless liquid, n_(D) ²⁶ =1.5133.

NMR: δ_(ppm) ^(CDCl).sbsp.3 1.80-2.80 (6H, m), 3.42 (2H, t, J=7 Hz), 3.96 (3H, s), 11.18 (1H, s).

Elementary analysis for C₆ H₁₀ N₄ O₂ S: Calcd. (%): C, 35.63; H, 4.98; N, 27.70. Found (%): C, 35.76; H, 5.11; N, 27.81.

EXAMPLES 120 AND 121

Substitution of methyl 4-(1-phenyl- or cyclohexyl-1,2,3,4-tetrazol-5-yl)thio-valerate for methyl 4-(1-methyl-1,2,3,4-tetrazol-5-yl)thio-valerate in the procedure of Example 119 produces the following compounds.

(120) 4-(1-Phenyl-1,2,3,4-tetrazol-5-yl)thiovaleric acid, pale yellow liquid, NMR: δ_(ppm) ^(CDCl).sbsp.3 2.00-2.70 (4H, m), 3.44 (2H, t, J=7 Hz), 7.55 (5H, s), 10.98 (1H, br.s)

(121) 4-(1-Cyclohexyl)-1,2,3,4-tetrazol-5-yl)thio-valeric acid, colorless prisms (ether), m.p. 67.5°-69.5° C.

EXAMPLE 122

In the same manner as described in Example 63, there is obtained N,N-diethyl-4-(1-cyclohexyl-1,2,3,4-tetrazol-5-yl)thio-butyramide, colorless liquid, n_(D) ²⁰ =1.5237.

EXAMPLE 123

In the same manner as described in Example 105, there is obtained methyl 4-[1-(4-ethylphenyl)-1,2,3,4-tetrazol-5-yl)thio-butyrate, pale yellow liquid, n_(D) ¹⁴ =1.5581.

EXAMPLE 124

In the same manner as described in Example 119, there is obtained 4-[1-(4-ethylphenyl)-1,2,3,4-tetrazol-5-yl)thio-butyric acid, pale yellow liquid, NMR: δ_(ppm) ^(CDCl).sbsp.3 1.28 (3H, t, J=7.5 Hz), 2.00-2.90 (6H, m), 3.44 (2H, t, J=7 Hz), 7.36 (2H, d, J=9 Hz), 7.48 (2H, d, J=9 Hz), 10.60 (1H, br.s).

EXAMPLES 125 TO 130

According to the same procedure as described in Example 71, the following compounds are obtained.

(125) N-Hexyl-5-(1-phenyl-1,2,3,4-tetrazol-5-yl)valeramide, colorless needles (ethyl acetate-hexane), m.p. 80.5°-82.5° C.

(126) N-Isopropyl-N-cyclohexyl-5-(1-phenyl-1,2,3,4-tetrazol-5-yl)valeramide, colorless needles (ether), m.p. 91°-92.5° C.

(127) N-Ethyl-N-cyclohexyl-4-(1-phenyl-1,2,3,4-tetrazol-5-yl)butyramide, colorless needles (ether), m.p. 77.5°-80° C.

(128) N-Butyl-4-(1-phenyl-1,2,3,4-tetrazol-5-yl)butyramide, colorless needles (ethyl acetate-hexane), m.p. 76.5°-78.5° C.

(129) N-Cyclohexyl-5-(1-phenyl-1,2,3,4-tetrazol-5-yl)valeramide, colorless needles (ethyl acetate-hexane), m.p. 100°-102° C.

(130) N-Methyl-N-cyclohexyl-5-(1-phenyl-1,2,3,4-tetrazol-5-yl)valeramide, colorless oily substance, n_(D) ²¹ =1.5396

EXAMPLES 131-179

According to the same procedure as described in Examples 6 and 81, the following compounds are obtained.

(131) N-Ethyl-3-(1-methyl-1,2,3,4-tetrazol-5-yl)methylthio-propionamide, colorless flakes (hexane-ethyl acetate), m.p. 61.5°-62.5° C.

(132) N-Ethyl-3-(1-ethyl-1,2,3,4-tetrazol-5-yl)methylthio-propionamide, pale yellow liquid, n_(D) ²⁷ =1.5253

(133) N-Ethyl-3-(1-isopropyl-1,2,3,4-tetrazol-5-yl)methylthio-propionamide, colorless liquid, n_(D) ²² =1.5179

(134) N-Ethyl-3-(1-butyl-1,2,3,4-tetrazol-5-yl)methylthio-propionamide, pale yellow liquid, n_(D) ¹⁸ =1.5149

(135) N-Ethyl-3-(1-cyclohexyl-1,2,3,4-tetrazol-5-yl)methylthio-propionamide, colorless needles (hexane-ethyl acetate), m.p. 131°-132° C.

(136) N-Ethyl-3-(1-phenyl-1,2,3,4-tetrazol-5-yl)methylthio-propionamide, colorless needles (hexane-ethyl acetate), m.p. 88°-89.5° C.

(137) N-Ethyl-3-[1-(4-ethylphenyl)-1,2,3,4-tetrazol-5-yl]methylthio-propionamide, colorless needles (hexane-ethyl acetate), m.p. 88°-89.5° C.

(138) N,N-Diethyl-3-(1-butyl-1,2,3,4-tetrazol-5-yl)methylthio-propionamide, reddish brown liquid, n_(D) ²⁶ =1.5107

(139) N,N-Diethyl-3-(1-phenyl-1,2,3,4-tetrazol-5-yl)methylthio-propionamide, yellowish brown liquid, n_(D) ²⁶ =1.5625

(140) N-Ethyl-4-(1-ethyl-1,2,3,4-tetrazol-5-yl)methylthio-butyramide, pale yellow liquid, n_(D) ²⁶ =1.5224

(141) N-Ethyl-2-(1-ethyl-1,2,3,4-tetrazol-5-yl)methylthio-acetamide, pale yellow liquid, n_(D) ²² =1.5305

(142) N-Ethyl-2-(1-ethyl-1,2,3,4-tetrazol-5-yl)ethylthio-acetamide, pale yellow liquid, n_(D) ²² =1.5274

(143) N-Ethyl-2-(1-ethyl-1,2,3,4-tetrazol-5-yl)propylthio-acetamide, pale yellow liquid, n_(D) ²³ =1.5210

(144) N,N-Diethyl-4-(1-ethyl-1,2,3,4-tetrazol-5-yl)methylthio-butyramide, pale yellow liquid, n_(D) ²⁵ =1.5128

(145) N-Methyl-3-(1-ethyl-1,2,3,4-tetrazol-5-yl)methylthio-propionamide, colorless liquid, n_(D) ²⁴ =1.5320

(146) N-Butyl-3-(1-ethyl-1,2,3,4-tetrazol-5-yl)methylthio-propionamide, pale yellow liquid, n_(D) ²¹ =1.5111

(147) N-Methyl-N-(2-thienylmethyl)-3-(1-ethyl-1,2,3,4-tetrazol-5-yl)methylthio-propionamide, colorless liquid, n_(D) ²⁷ =1.5697

(148) N-(2-Thiazolyl)-3-(1-ethyl-1,2,3,4-tetrazol-5-yl)methylthio-propionamide, pale yellow prisms (hexane-ethyl acetate), m.p. 113°-114° C.

(149) N,N-Diethyl-4-(1-phenyl-1,2,3,4-tetrazol-5-yl)thio-butyramide, colorless liquid, n_(D) ¹⁸ =1.5592

(150) N,N-Diethyl-4-(1-cyclohexyl-1,2,3,4-tetrazol-5-yl)thio-butyramide, colorless liquid, n_(D) ²⁰ =1.5237

(151) N-Pentyl-4-(1-methyl-1,2,3,4-tetrazol-5-yl)thio-butyramide, colorless crystal (hexane-ether), m.p. 67.5°-68.5° C.

(152) N-(4-Methoxyphenyl)-5-(1-phenyl-1,2,3,4-tetrazol-5-yl)valeramide, colorless crystal (ethanol), m.p. 148°-150.5° C.

(153) N-Butyl-5-(1-phenyl-1,2,3,4-tetrazol-5-yl)valeramide, colorless crystal (ethyl acetate-hexane), m.p. 71°-73° C.

(154) N-(2-Thiazolyl)-4-(1-methyl-1,2,3,4-tetrazol-5-yl)thio-butyramide, colorless crystal (methanol), m.p. 175°-176.5° C.

(155) N-(4-Methoxyphenyl)-4-(1-methyl-1,2,3,4-tetrazol-5-yl)thio-butyramide, colorless crystal (hexane-ethyl acetate), m.p. 122.5°-124° C.

(156) N-(3-Methoxyphenyl)-4-(1-methyl-1,2,3,4-tetrazol-5-yl)thio-butyramide, colorless crystal (hexane-ethyl acetate), m.p. 122.5°-124° C.

(157) N-(1-Methylpropyl)-4-(1-methyl-1,2,3,4-tetrazol-5-yl)thio-butyramide, colorless liquid, n_(D) ²⁰ =1.5066

(158) N-Butyl-4-(1-phenyl-1,2,3,4-tetrazol-5-yl)thio-butyramide, colorless liquid, n_(D) ²².5 =1.5590

(159) N-Butyl-3-(1-methyl-1,2,3,4-tetrazol-5-yl)thio-propionamide, colorless crystal (ethyl acetate-hexane), m.p. 80.5°-82.5° C.

(160) N-Butyl-5-(1-methyl-1,2,3,4-tetrazol-5-yl)thio-valeramide, colorless crystal (ether), m.p. 53.5°-55° C.

(161) N-Ethyl-N-cyclohexyl-5-[1-(4-methoxyphenyl)-1,2,3,4-tetrazol-5-yl]valeramide, colorless liquid, n_(D) ¹⁶ =1.5343

(162) N-Ethyl-N-phenyl-5-(1-phenyl-1,2,3,4-tetrazol-5-yl)valeramide, colorless liquid, n_(D) ¹⁶ =1.5640

(163) N-Ethyl-N-cyclohexyl-5-[1-(4-acetyloxyphenyl)-1,2,3,4-tetrazol-5-yl]valeramide, white powdery crystal (ethyl acetate-hexane), m.p. 88°-90° C.

(164) N-Ethyl-N-cyclohexyl-5-[1-(4-hydroxyphenyl)-1,2,3,4-tetrazol-5-yl]valeramide, colorless granules (ethanol), m.p. 181.5°-183° C.

(165) N-Ethyl-N-cyclohexyl-5-[1-(4-ethylphenyl)-1,2,3,4-tetrazol-5-yl]valeramide, colorless needles (ethyl acetate-hexane), m.p. 54°-55.5° C.

(166) N-Ethyl-N-cyclohexyl-5-(1-butyl-1,2,3,4-tetrazol-5-yl)valeramide, colorless liquid, n_(D) ²⁰.5 =1.5013

(167) 5-[3-(4-Methylpiperazinylcarbonyl)propyl]-1-phenyl-1,2,3,4-tetrazole, pale yellow needles (ethyl acetate-hexane), m.p. 62°-64° C.

(168) N-Ethyl-N-cyclohexyl-3-(1-phenyl-1,2,3,4-tetrazol-5-yl)propionamide, colorless prisms (ethanol), m.p. 137°-138° C.

(169) 5-[4-(4-Methylpiperazinylcarbonyl)butyl]-1-phenyl-1,2,3,4-tetrazole, pale yellow liquid, n_(D) ¹⁵.5 =1.5543

(170) N-(4-Methoxycyclohexyl)-5-(1-phenyl-1,2,3,4-tetrazol-5-yl)valeramide, colorless needles (hexane-ethyl acetate), m.p. 89°-90.5° C.

(171) N-Ethyl-N-(2-hydroxycyclohexyl)-5-(1-phenyl-1,2,3,4-tetrazol-5-yl)valeramide, colorless liquid, n_(D) ¹⁶ =1.5501

(172) N,N-Dipropyl-5-(1-phenyl-1,2,3,4-tetrazol-5-yl)valeramide, colorless liquid, n_(D) ¹⁵.5 =1.5311

(173) N-Methyl-N-(2-furylmethyl)-5-(1-phenyl-1,2,3,4-tetrazol-5-yl)valeramide, colorless liquid, n_(D) ¹⁶.5 =1.5490

(174) N-Ethyl-N-cyclooctyl-5-(1-phenyl-1,2,3,4-tetrazol-5-yl)valeramide, colorless liquid, n_(D) ¹⁶.5 =1.5418

(175) N-Ethyl-N-(4-hydroxycyclohexyl)-5-(1-phenyl-1,2,3,4-tetrazol-5-yl)valeramide, colorless liquid, n_(D) ¹⁵.5 =1.5505

(176) N-Ethyl-N-cyclopentyl-5-(1-phenyl-1,2,3,4-tetrazol-5-yl)valeramide, colorless liquid, n_(D) ²⁰ =1.5446

(177) N-(2-Thiazolyl)-5-(1-phenyl-1,2,3,4-tetrazol-5-yl)valeramide, colorless needles (ethanol), m.p. 166°-168° C.

(178) N-Ethyl-5-(1-phenyl-1,2,3,4-tetrazol-5-yl)valeramide, colorless flakes (ethyl acetate-hexane), m.p. 60°-61.5° C.

(179) N,N-Diethyl-3-(1-phenyl-1,2,3,4-tetrazol-5-yl)methylthio-propionamide, yellowish brown liquid, n_(D) ²⁶ =1.5625

EXAMPLES 180-185

According to the same procedure as described in Example 108, the following compounds are obtained.

(180) 3-(1-Methyl-1,2,3,4-tetrazol-5-yl)methylthiopropionic acid, colorless prisms (hexane-ethyl acetate), m.p. 80.5°-82.5° C.

(181) 3-(1-Isopropyl-1,2,3,4-tetrazol-5-yl)methylthio-propionic acid, colorless prisms (hexane-ethyl acetate), m.p. 56°-59° C.

(182) 3-(1-Butyl-1,2,3,4-tetrazol-5-yl)methylthiopropionic acid, pale yellow prisms (ether-hexane), m.p. 33°-35° C.

(183) 3-(1-Cyclohexyl-1,2,3,4-tetrazol-5-yl)methylthio-propionic acid, colorless needles (ethyl acetate), m.p. 108°-110° C.

(184) 3-(1-Phenyl-1,2,3,4-tetrazol-5-yl)methylthiopropionic acid, colorless prisms (hexane-ethyl acetate), m.p. 102°-103° C.

(185) 3-(1-Ethyl-1,2,3,4-tetrazol-5-yl)methylthiopropionic acid, colorless prisms (acetone-ether), m.p. 68°-70° C.

EXAMPLE 186

According to the same procedure as described in Example 105, the following compound is obtained.

Methyl 4-[1-(4-ethylphenyl)-1,2,3,4-tetrazol-5-yl]thio-butyrate, colorless liquid, n_(D) ¹⁴ =1.5581

EXAMPLES 187-192

According to the same procedure as described in Example 115, the following compounds are obtained.

(187) 5-[1-(4-Methoxyphenyl)-1,2,3,4-tetrazol-5-yl]valeric acid, colorless needles (ethanol-water), m.p. 105°-107° C.

(188) 5-(1-Butyl-1,2,3,4-tetrazol-5-yl)valeric acid, colorless prisms (ether), m.p. 66.5°-68° C.

(189) 4-(1-Phenyl-1,2,3,4-tetrazol-5-yl)butyric acid, colorless prisms (ethanol-water), m.p. 82.5°-84.5° C.

(190) 5-[1-(4-Acetyloxyphenyl)-1,2,3,4-tetrazol-5-yl]valeric acid, colorless flakes (ethanol), m.p. 109°-110° C.

(191) 3-(1-Phenyl-1,2,3,4-tetrazol-5-yl)propionic acid, colorless needles (ethyl acetate), m.p. 120°-122.5° C.

(192) 5-[1-(2-Hydroxyphenyl)-1,2,3,4-tetrazol-5-yl]valeric acid, pale brown prisms (acetone-water), m.p. 180°-183° C.

EXAMPLE 193

To 3-(1-ethyl-1,2,3,4-tetrazol-5-yl)methylthiopropionic acid (20 g) is added thionyl chloride (30 ml), and the mixture is stirred at 50° C. for 30 minutes. Excess amount of thionyl chloride is distilled off and further it is completely removed by azeotropic distillation with benzene.

Separately, 25% aqueous ammonia (20 ml) and potassium carbonate (12.8 g) are dissolved in acetone-water (150 ml-30 ml). To the solution is added dropwise a solution of the acid chloride obtained above in acetone (30 ml) with stirring under ice-cooling, and the mixture is stirred for 2 hours. After acetone is distilled off, the aqueous phase is saturated with sodium chloride and then is extracted with chloroform. The chloroform solution is dried over magnesium sulfate and concentrated under reduced pressure. The resulting residue is recrystallized from ethyl acetate to give 3-(1-ethyl-1,2,3,4-tetrazol-5-yl)methylthio-propionamide (9.2 g) as colorless flakes. m.p. 74°-76° C.

EXAMPLE 194

In the same manner as described in Example 193, 3-(1-phenyl-1,2,3,4-tetrazol-5-yl)methylthio-propionamide is obtained as colorless prisms (recrystallized from ethyl acetate). m.p. 91°-92° C.

EXAMPLE 195

In the same manner as described in Example 71, N-cyclohexyl-N-(2-hydroxyethyl)-5-(1-phenyl-1,2,3,4-tetrazol-5-yl)valeramide as colorless liquid. n_(D) ¹⁶.5 =1.5470.

Preparation 1

    ______________________________________                                         Ingredients                Amounts                                             ______________________________________                                         N--Ethyl-N--(2-hydroxycyclohexyl)-4-(1-methyl-                                                            150 g                                               1,2,3,4-tetrazol-5-yl)thio-butyramide                                          Avicel (trade mark of microcrystalline cellulose                                                          40 g                                                produced by Asahi-kasei Co., Ltd.)                                             Corn starch                30 g                                                Magnesium stearate          2 g                                                Hydroxypropylmethyl cellulose                                                                             10 g                                                Polyethylene glycol-6000    3 g                                                Castor oil                 40 g                                                Methanol                   40 g                                                ______________________________________                                    

The compound of the present invention, Avicel, corn starch and magnesium stearate are mixed, ground and then, compressed into tablets with a punch having a diameter of 10 mm. The tablets thus obtained are coated with the film coating solution consisting of hydroxypropylmethyl cellulose, polyethylene glycol-6000, castor oil and methanol to obtain film coated tablets.

Preparation 2

    ______________________________________                                         Ingredients          Amounts                                                   ______________________________________                                         N--(2-Pyridyl)-4-(1-methyl-1,2,3,4-                                                                 150 g                                                     tetrazol-5-yl)thio-butyramide                                                  Citric acid           1 g                                                      Lactose              33.5 g                                                    Dipotassium hydrogen phosphate                                                                      70 g                                                      Pluronic F-68        30 g                                                      Sodium lauryl sulfate                                                                               15 g                                                      Polyvinyl pyrrolidone                                                                               15 g                                                      Polyethylene glycol (Carbowax 1500)                                                                 4.5 g                                                     Polyethylene glycol (Carbowax 6000)                                                                 45 g                                                      Corn starch          30 g                                                      Dry sodium lauryl sulfate                                                                            3 g                                                      Dry magnesium stearate                                                                               3 g                                                      Ethanol              appropriate amount                                        ______________________________________                                    

The compound of the present invention, citric acid, lactose, dipotassium hydrogen phosphate, Pluronic F-68 and sodium lauryl sulfate are mixed and passed through No. 60 screen. The resulting mixture is granulated with an alcoholic solution containing polyvinyl pyrrolidone, Carbowax 1500 and Carbowax 6000. The powdery mixture is made into paste by adding alcohol, if necessary. Corn starch is added to the wet mass and mixing is continued until uniform granules are formed. The wet granules are passed through No. 10 screen, placed in a try and dried in an oven at 100° C. for 12-14 hours. The dried granules are passed through No. 16 screen, mixed with dry sodium lauryl sulfate and dry magnesium stearate and then, compressed into a desired shape.

The core tablets thus obtained are treated with varnish and thereto is spreaded talc in order to prevent absorption of moisture. Subcoating is applied about the resulting tablets. The tablets are again treated enough times with varnish for oral administration. Further, subcoating and smooth layers are applied about the tablets so as to make them round and smooth. Coloring layer is applied so as to be the tablets in desired color. After drying, polishing produces the tablets having homogeneous gloss.

Preparation 3

    ______________________________________                                         Ingredients              Amounts                                               ______________________________________                                         N--Ethyl-N--cyclohexyl-4-(1-methyl-1,2,3,4-                                                             5        g                                            tetrazol-5-yl)thio-butyramide                                                  Polyethylene glycol (molecular weight 4000)                                                             0.3      g                                            Sodium chloride          0.9      g                                            Polyoxyethylene sorbitan monooleate                                                                     0.4      g                                            Sodium metabisulfite     0.1      g                                            Methyl-paraben           0.18     g                                            Propyl-paraben           0.02     g                                            Distilled water for injection                                                                           100      ml                                           ______________________________________                                    

The above parabens, sodium metabisulfite and sodium chloride are dissolved in an about half amount of the distilled water with stirring at 80° C. The resulting solution is cooled to 40° C. and the above compound of the present invention, polyethylene glycol and polyoxyethylene sorbitan monooleate are dissolved in the solution. The remaining distilled water is added to the solution to adjust the volume. The solution is sterilized by filtration with a suitable filter paper to obtain a preparation for injection.

Pharmacological tests:

The pharmacological activities of the compounds [I] of the present invention were tested by conventional methods as mentioned hereinafter with respect to the following compounds:

1. N,N-Diethyl-4-(1-methyl-1,2,3,4-tetrazol-5-yl)thio-butyramide

2. N-Ethyl-N-cyclohexyl-4-(1-methyl-1,2,3,4-tetrazol-5-yl)thio-butyramide

3. N-Ethyl-N-cyclohexyl-5-(1-methyl-1,2,3,4-tetrazol-5-yl)thio-valeramide

4. N-Ethyl-N-cyclohexyl-5-(1-phenyl-1,2,3,4-tetrazol-5-yl)valeramide

5. N,N-Diethyl-5-(1-cyclohexyl-1,2,3,4-tetrazol-5-yl)valeramide

6. N-cyclohexyl-4-(1-methyl-1,2,3,4-tetrazol-5-yl)thio-butyramide

7. N-[4-(N,N-dimethylamino)phenyl]-4-(1-methyl-1,2,3,4-tetrazol-5-yl)thio-butyramide

8. N-Ethyl-N-(2-hydroxycyclohexyl)-4-(1-methyl-1,2,3,4-tetrazol-5-yl)thio-butyramide

9. N-Ethyl-N-phenyl-4-(1-methyl-1,2,3,4-tetrazol-5-yl)thio-butyramide

10. N-Ethyl-N-(2-pyridyl)-4-(1-methyl-1,2,3,4-tetrazol-5-yl)thio-butyramide

11. N-Cyclohexyl-N-[2-(3,4,-dimethoxyphenyl)ethyl]-4-(1-methyl-1,2,3,4-tetrazol-5-yl)thio-butyramide

12. N,N-Diethyl-3-[1-(4-ethylphenyl)-1,2,3,4-tetrazol-5-yl]methylthio-propionamide

13. N-Furfuryl-4-(1-methyl-1,2,3,4-tetrazol-5-yl)thio-butyramide

14. N,N-Diethyl-3-(1-ethyl-1,2,3,4-tetrazol-5-yl)methylthio-propanamide

15. N-Ethyl-3-(1-butyl-1,2,3,4-tetrazol-5-yl)methylthio-propionamide

16. N-Ethyl-3-(1-phenyl-1,2,3,4-tetrazol-5-yl)methylthio-propionamide

17. N-Ethyl-4-(1-ethyl-1,2,3,4-tetrazol-5-yl)methylthio-butyramide

18. N,N-Diethyl-4-(1-ethyl-1,2,3,4-tetrazol-5-yl)methylthio-butyramide

19. 3-(1-Ethyl-1,2,3,4-tetrazol-5-yl)methylthio-propionamide

20. N-Ethyl-N-cyloheptyl-4-(1-methyl-1,2,3,4-tetrazol-5-yl)thio-butyramide

21. N,N-Diisopropyl-4-(1-methyl-1,2,3,4-tetrazol-5-yl)thio-butyramide

22. N,N-Dibenzyl-4-(1-methyl-1,2,3,4-tetrazol-5-yl)thio-butyramide

23. N-Ethyl-N-cyclohexyl-5-(1-cyclohexyl-1,2,3,4-tetrazol-5-yl)valeramide

24. N-Isopropyl-N-cyclohexyl-4-(1-methyl-1,2,3,4-tetrazol-5-yl)thio-butyramide

25. 1-Methyl-5-(3-piperidylcarbonylpropyl)thio-1,2,3,4-tetrazole

26. N-[2-(3,4-Dimethoxyphenyl)ethyl]-4-(1-methyl-1,2,3,4-tetrazol-5-yl)thio-butyramide

27. N-(2-Pyridyl)-4-(1-methyl-1,2,3,4-tetrazol-5-yl)thio-butyramide

28. N,N-Dimethyl-4-(1-methyl-1,2,3,4-tetrazol-5-yl)thio-butyramide

29. N-Ethyl-N-cyclopentyl-4-(1-methyl-1,2,3,4-tetrazol-5-yl)thio-butyramide

30. N-Ethyl-N-cyclohexylmethyl-4-(1-methyl-1,2,3,4-tetrazol-5-yl)thio-butyramide

31. N-Ethyl-N-cyclohexyl-4-(1-phenyl-1,2,3,4-tetrazol-5-yl)thio-butyramide

32. 1-Methyl-5-[3-(4-acetyl-1-piperazinylcarbonyl)propyl]thio-1,2,3,4-tetrazol

33. 1-Methyl-5-(3-morpholinocarbonylpropyl)thio-1,2,3,4-tetrazole

34. N,N-Diethyl-5-(1-methyl-1,2,3,4-tetrazol-5-yl)valeramide

35. N,N-Diethyl-5-(1-phenyl-1,2,3,4-tetrazol-5-yl)valeramide

36. N-Ethyl-N-cyclohexyl-3-(1-ethyl-1,2,3,4-tetrazol-5-yl)methylthio-propionamide

37. Methyl 4-(1-methyl-1,2,3,4-tetrazol-5-yl)thio-butyrate

38. 4-(1-methyl-1,2,3,4-tetrazol-5-yl)thiobutyric acid

39. N-Methyl-N-(2-thienylmethyl)-4-(1-methyl-1,2,3,4-tetrazol-5-yl)thio-butyramide

40. N-(2-Hydroxyethyl)-N-phenyl-4-(1-methyl-1,2,3,4-tetrazol-5-yl)thio-butyramide

41. N-(4-Sulfamoylphenyl)-4-(1-methyl-1,2,3,4-tetrazol-5-yl)thio-butyramide

42. N-(2-Methyl-3-chlorophenyl)-4-(1-methyl-1,2,3,4-tetrazol-5-yl)thio-butyramide

43. N-(4-Nitrophenyl)-4-(1-methyl-1,2,3,4-tetrazol-5-yl)thio-butyramide

44. N,N-Diethyl-3-(1-ethyl-1,2,3,4-tetrazol-5-yl)methylthio-propionamide

45. N-(4-Methoxycyclohexyl)-4-(1-methyl-1,2,3,4-tetrazol-5-yl)thio-butyramide

46. N-Ethyl-N-cyclohexyl-4-(1-phenyl-1,2,3,4-tetrazol-5-yl)butyramide

47. N-(n-Butyl)-5-(1-phenyl-1,2,3,4-tetrazol-5-yl)valeramide

48. N-(n-Hexyl)-5-(1-phenyl-1,2,3,4-tetrazol-5-yl)valeramide

49. N-(4-Methoxyphenyl)-5-(1-phenyl-1,2,3,4-tetrazol-5-yl)valeramide

50. N-Isopropyl-N-cyclohexyl-5-(1-phenyl-1,2,3,4-tetrazol-5-yl)valeramide

51. N-Ethyl-N-cyclohexyl-5-(1-methyl-1,2,3,4-tetrazol-5-yl)valeramide

52. N,N-Diethyl-5-(1,2,3,4-tetrazol-5-yl)valeramide

53. 3-[1-(4-Ethylphenyl)-1,2,3,4-tetrazol-5-yl]methylthio-propionic acid

54. Methyl 5-(1-cyclohexyl-1,2,3,4-tetrazol-5-yl)valerate

55. N-Cyclohexyl-N-butyl-5-(1-methyl-1,2,3,4-tetrazol-5-yl)thio-butyramide

56. N-Ethyl-N-cyclooctyl-5-(1-methyl-1,2,3,4-tetrazol-5-yl)thio-butyramide

57. N-[4-(N,N-Dimethylamino)phenyl]-5-(1-methyl-1,2,3,4-tetrazol-5-yl)thio-butyramide

58. N,N-Dicyclohexyl-5-(1-methyl-1,2,3,4-tetrazol-5-yl)thio-butyramide

Pharmacological Test 1:

The pharmacological activities of the compouns (I) were tested by a Shay rat pylorus ligation method (cf. H. Shay et al: Gastroenterol, Vol. 5, page 43, 1945) which is the most popular method for testing of gastric juice secretion-inhibiting activity. The test was carried out by using male Wistar rats, weighing about 170 g and fasting for 24 hours.

Test compounds were administered 30 minutes before the pylorus ligation in a dose of 100 mg/kg in subcutaneous route, and the volume, total acidity and/or pepsin activity of the gastric juice were measured 4 hours after the ligation. As a control, a saline solution was administered instead of the test compound. The inhibitory ratio (%) of the test compounds was calculated when the inhibitory activities of the control were counted as zero (0). The results are shown in Table 1.

In the table, the inhibitory ratio (%) was evaluated as follows:

-: less than 10%

+: 10 to less than 50%

++: more than 50%

                  TABLE 1                                                          ______________________________________                                         Test      Inhibitory ratio                                                     compound  Volume of      Total   Pepsin                                        No.       gastric juice  acidity activity                                      ______________________________________                                          1        ++             ++      ++                                             2        ++             ++      ++                                             3        ++             +       +                                              4        +              +       +                                              5        +              +       +                                              6        +              +       +                                              7        ++             +       +                                              8        +              +       +                                              9        ++             +       ++                                            10        +              +       +                                             11        +              +       +                                             12        +              +       +                                             13        +              +       +                                             20        ++             +       -                                             21        ++             +       -                                             22        +              +       -                                             23        +              +       -                                             24        ++             +       -                                             25        +              +       +                                             26        ++             +       -                                             27        +              +       +                                             28        + +            ++      +                                             29        ++             ++      +                                             30        ++             +       +                                             31        ++             +       +                                             32        +              +       +                                             33        +              +       +                                             34        +              +       +                                             35        +              +       +                                             36        ++                                                                   37        +                                                                    38        +                                                                    39        ++                                                                   40        +                                                                    41        +                                                                    42        +                                                                    43        +                                                                    44        +                                                                    45        +                                                                    46        +              +       -                                             51        +                                                                    52        +                                                                    53        +                                                                    54        +                                                                    ______________________________________                                    

Pharmacological Test 2: Stress ulcer

After male Wistar rats weighing about 170 g was fasted for 24 hours, the rats were restrained in a stress cage and dipped in water bath at 23° C. till chest of the animals. After 7 hours, the rats were killed and the stomach was isolated. Into the isolated stomach 10% formalin (8 ml) was poured and settled. The stomach was cut open at the greater curvature, and the length of each ulcer on the membrane was measured. Sum of the length of all ulcers was shown as ulcer index (UI). The test compound was orally administered to the rats before restraint in a stress cage in the form of 0.5% CMC suspension in a concentration of 1×10⁻³ mole. As a control, only the solvent (CMC solution) was administered likewise.

The inhibitory ratio (%) of stress ulcer of the test compounds was calculated by the following equation: ##EQU1##

The results are shown in Table 2. In the table, the inhibitory ratio (%) was evaluated as follows:

+: 30 to less than 60%

++: more than 60%.

                  TABLE 2                                                          ______________________________________                                         Test   Inhibi-   Test    Inhibi- Test  Inhibi-                                 comp.  tory      comp.   tory    comp. tory                                    No.    ratio     No.     ratio   No.   ratio                                   ______________________________________                                         1      ++        17      +       48    +                                       4      ++        18      +       49    +                                       7      ++        23      +       50    ++                                      8      ++        34      +       51    +                                       14     ++        35      +       52    +                                       15     ++        46      ++      44    ++                                      16     +         47      +                                                     ______________________________________                                    

Pharmacological Test 3: Acetic acid-induced ulcer

Male Wistar rats were used. Under anestherization, the abdomen of rats was opened to expose stomach, and then 30% aqueous acetic acid (0.015 ml) was injected below serous membrane which was loacated at boundary area of true gastric gland and pyloric glands and thereafter the abdomen was closed, by which an experimental ulcer was induced.

The test compound was orally administered in the dose as shown in Table 3 in the form of 0.5% CMC suspension or solution twice a day for 12 days after the acetic acid-induced ulcer was produced. As a control, only the solvent (CMC solution) was administered likewise.

After the reproduced mucous membrane was removed around the ulcers, the open area of ulcers was measured with a micrometer, and the sum of ulcer area was shown as ulcer index (UI). The inhibitory ratio (%) of acetic acid-induced ulcer of the test compounds was calculated in the same manner as in Pharmacological Test 2.

The results are shown in Table 3. In the table, the inhibitory ratio (%) was evaluated as follows:

+: 30 to less than 60%

++: more than 60%

                  TABLE 3                                                          ______________________________________                                                                    Inhibitory                                          Test compound No.                                                                             Dose        ratio                                               ______________________________________                                         19             3 × 10.sup.-5                                                                        +                                                                  mole/kg · day                                           2             20 mg/kg · day                                                                    +                                                    9             "           +                                                   26             "           +                                                   28             "           +                                                   37             "           +                                                   55             "           +                                                   56             "           +                                                   57             "           +                                                   58             "           +                                                   ______________________________________                                    

Pharmacological Test 4: Indomethacin-induced ulcer

After male Wistar rats weighing about 160 g was fasted for 24 hours, indomethacin was subcutaneously administered to the rats in a dose of 20 mg/kg in the form of a suspension in a mixture of 0.5% CMC and a small amount of Tween 80 (i.e. polyoxyethylene sorbitan monooleate). After 5 hours, the rats were killed and the stomach was isolated. Into the isolated stomach 10% formalin (8 ml) was poured and settled. The stomach was cut open at the greater curvature, and the length of each ulcer on the membrane was measured, based on which results the inhibitory ratio of the indomethacin-induced ulcer of the test compounds was calculated in the same manner as in Pharmacological Test 2. The test compound was orally administered to the rats in a concentration of 3×10⁻⁴ mole in the form of 0.5% CMC suspension 30 minutes before the administration of indomethacin.

The results are shown in Table 4. In the table, the inhibitory ratio (%) was evaluated as follows:

+: 30 to less than 60%

++: more than 60%.

                  TABLE 4                                                          ______________________________________                                         Test       Inhibitory Test        Inhibitory                                   compound No.                                                                              ratio      compound No.                                                                               ratio                                        ______________________________________                                         39         +          47          +                                            45         ++         49          +                                            46         ++                                                                  ______________________________________                                    

Acute toxicity:

The test compounds were orally administered to male Wistar rats, and the half lethal dose (LD₅₀) was measured. The results are shown in Table 5.

                  TABLE 5                                                          ______________________________________                                         Test compound No.                                                                              LD.sub.50 (mg/kg, p.o.)                                        ______________________________________                                         1               >500                                                           2               >500                                                           3               >500                                                           4               >500                                                           5               >500                                                           6               >500                                                           7               >500                                                           8               >500                                                           9               >500                                                           10              >500                                                           11              >500                                                           12              >500                                                           13              >500                                                           16              >500                                                           17              >500                                                           19              >500                                                           ______________________________________                                     

What is claimed is:
 1. A tetrazole derivative of the formula: ##STR17## wherein R¹ is hydrogen, alkyl having from 1 to 6 carbon atoms, cycloalkyl having from 3 to 12 ring carbon atoms or phenyl;A is sulfur or alkylene-thio having from 1 to 6 carbon atoms; l is 0 or 1; B is alkylene having from 1 to 6 carbon atoms; R³ is hydrogen, alkyl having from 1 to 6 carbon atoms, cycloalkyl having from 3 to 12 ring carbon atoms, phenyl, cycloalkyl-alkyl having from 1 to 6 carbon atoms in the alkyl moiety and from 3 to 8 carbon atoms in the cycloalkyl moiety, phenyl-alkyl having from 1 to 6 carbon atoms in the alkyl moiety, or hydroxyalkyl having 1 to 6 carbon atoms in the alkyl moiety; R⁴ is a member selected from the unsaturated heterocyclic groups consisting of pyridyl, pyrrolyl, imidazolyl, pyrazolyl, pyrimidinyl, pyridazinyl, pyrazinyl, oxazolyl, isoxazolyl, 4H-1,4-oxazinyl, thiazolyl, isothiazolyl, 4H-1,4-thiazinyl, furyl, 2H-pyranyl, 4H-pyranyl, and thienyl; or alkyl having from 1 to 6 carbon atoms and being substituted by one of said unsaturated heterocyclic groups; said cycloalkyl, phenyl and phenylalkyl optionally have on the cycloalkyl or phenyl ring one or two substituents selected from the group consisting of alkoxy having from 1 to 6 carbon atoms, alkyl having from 1 to 6 carbon atoms, halo, N,N-dialkylamino having 1 to 6 carbon atoms in each alkyl moiety, nitro, aminosulfonyl, hydroxy and alkanoyloxy having from 1 to 6 carbon atoms; or a pharmaceutically acceptable salt thereof.
 2. A compound according to claim 1, wherein l is
 0. 3. A compound according to claim 1, wherein l is
 1. 4. A compound according to claim 3, wherein A is alkylene-thio having from 1 to 6 carbon atoms.
 5. A compound according to claim 3, wherein A is sulfur.
 6. An anti-ulcer composition, which comprises as an essential active ingredient a therapeutically effective amount of a tetrazole derivative as set forth in claim 1 in admixture with a pharmaceutically acceptable diluent or carrier.
 7. A composition according to claim 6, wherein l is
 0. 8. A composition according to claim 6, wherein l is
 1. 9. A composition according to claim 8, wherein A is alkylene-thio having from 1 to 6 carbon atoms.
 10. A composition according to claim 8, wherein A is sulfur.
 11. A method for treating a peptic or duodenal ulcer by administering an effective amount of an anti-ulcer composition as set forth in claim
 6. 12. A method for treating a peptic or duodenal ulcer by administering an effective amount of an anti-ulcer composition as set forth in claim
 7. 13. A method for treating a peptic or duodenal ulcer by administering an effective amount of an anti-ulcer composition as set forth in claim
 8. 14. A method for treating a peptic or duodenal ulcer by administering an effective amount of an anti-ulcer composition as set forth in claim
 9. 15. A method for treating a peptic or duodenal ulcer by administering an effective amount of an anti-ulcer composition as set forth in claim
 10. 16. A tetrazole derivative of the formula: ##STR18## wherein R¹ is hydrogen, alkyl having from 1 to 6 carbon atoms, cycloalkyl having from 3 to 12 ring carbon atoms or phenyl;A is sulfur or alkylene-thio having from 1 to 6 carbon atoms; l is 0 or 1; B is alkylene having from 1 to 6 carbon atoms; R³ is hydrogen (--H), alkyl having from 1 to 6 carbon atoms, cycloalkyl having from 3 to 12 ring carbon atoms, phenyl, cycloalkyl-alkyl having from 1 to 6 carbon atoms in the alkyl moiety and from 3 to 8 carbon atoms in the cycloalkyl moiety, phenylalkyl having from 1 to 6 carbon atoms in the alkyl moiety, hydroxyalkyl having from 1 to 6 carbon atoms in the alkyl moiety, a saturated or unsaturated heterocyclic group, or alkyl having from 1 to 6 carbon atoms which is substituted by said saturated or unsaturated heterocyclic group; R⁴ is an unsaturated heterocyclic group, or alkyl having from 1 to 6 carbon atoms which is substituted by said unsaturated heterocyclic group; or R³ and R⁴, combined together with the nitrogen atom to which both are joined, with or without being intervened by an oxygen or nitrogen atom, form an unsaturated heterocyclic group which is optionally substituted with alkyl having from 1 to 6 carbon atoms or alkanoyl having from 1 to 6 carbon atoms; said cycloalkyl, phenyl and phenylalkyl optionally have on the cycloalkyl or phenyl ring one or two substituents selected from the group consisting of alkoxy having from 1 to 6 carbon atoms, alkyl having from 1 to 6 carbon atoms, halo, N,N-dialkylamino having from 1 to 6 carbon atoms in each alkyl moiety, nitro, aminosulfonyl, hydroxy and alkanoyloxy having from 1 to 6 carbon atoms; and wherein each saturated heterocyclic group is a member selected from the group consisting of pyrrolidinyl, piperidinyl, imidazolidinyl, piperazinyl, oxazolidinyl, morpholinyl, thiazolidinyl, tetrahydrofuryl, tetrahydropyranyl and tetrahydrothienyl, and each unsaturated heterocyclic group is a member selected from the group consisting of pyridyl, pyrrolyl, 3-pyrrolinyl, dihydropyridyl, 2-pyrazolinyl, 2-imidazolinyl, imidazolyl, pyrazolyl, 4,5-dihydropyrazolyl, pyrimidinyl, pyridazinyl, pyrazinyl, oxazolyl, isoxazolyl, 4H-1,4-oxazinyl, thiazolyl, isothiazolyl, 4H-1,4-thiazinyl, furyl, 2H-pyranyl, 4H-pyranyl and thienyl; or a pharmaceutically-acceptable salt thereof.
 17. A compound according to claim 16, wherein each unsaturated heterocyclic group is a member selected from the group consisting of pyridyl, pyrrolyl, imidazolyl, pyrazolyl, pyrimidinyl, pyridazinyl, pyrazinyl, oxazolyl, isoxazolyl, 4H-1,4-oxazinyl, thiazolyl, isothiazolyl, 4H-1,4-thiazinyl, furyl, 2H-pyranyl, 4H-pyranyl and thienyl.
 18. A compound according to claim 16, wherein l is 1; each saturated heterocyclic group is a member selected from the group consisting of pyrrolidinyl, piperidinyl, imidazolidinyl, piperazinyl, oxazolidinyl, morpholinyl, thiazolidinyl, tetrahydrofuryl, tetrahydropyranyl and tetrahydrothienyl; and each unsaturated heterocyclic group is a member selected from the group consisting of pyridyl, pyrrolyl, 3-pyrrolidinyl, dihydropyridyl, 2-pyrazolinyl, 2-imidazolinyl, imidazolyl, pyrazolyl, 4,5-dihydropyrazolyl, pyrimidinyl, pyridazinyl, pyrazinyl, oxazolyl, isoxazolyl, 4H-1,4-oxazinyl, thiazolyl, isothiazolyl, 4H-1,4-thiazinyl, furyl, 2H-pyranyl, 4H-pyranyl and thienyl.
 19. A compound according to claim 16 wherein l is 1, and R³ and R⁴ combine together with the nitrogen atom to which they are joined, with or without being intervened with oxygen or nitrogen, to form an unsaturated heterocyclic group selected from the group consisting of 1-imidazolyl, 1-pyrazolyl, 4,5-dihydropyrazol-1-yl, 1-pyrrolyl, and 4H-1,4-oxazin-4-yl.
 20. A method for treating a peptic or duodenal ulcer by administering to a patient affected therewith an effective amount of an anti-ulcer composition which comprises a tetrazole derivative according to claim 16 or a pharmaceutically-acceptable salt thereof in admixture with a pharmaceutically-acceptable diluent or carrier.
 21. A method according to claim 20, wherein R³ and R⁴ combine together with the nitrogen atom to which they are joined, with or without being intervened with oxygen or nitrogen, to form an unsaturated heterocyclic group selected from the group consisting of 1-imidazolyl, 1-pyrazolyl, 4,5-dihydropyrazol-1-yl, 1-pyrrolyl, and 4H-1,4-oxazin-4-yl. 